(edit Most barrels...) won't last very long as fire pits. I know this from burning trash when I was a kid. By the time the barrel was full it was falling apart. I never counted, but I would expect it to work well for about 10-20 burns and maybe 50-60 burns before its paper thin and falling apart.

Edit: The thickness of the metal is what matters. 18 gauge drums are what I find to be the industry standard; 18 gauge won't last very long in my opinion. A thicker drum would last longer. I personally own a fire pit object that is very thin, which probably would not last more than 10 burns. So it goes to show that any ol' manufacturer may not necessarily make a decent product.

I have seen barrels converted to wood stoves. I have seen some of them fall apart and I have seen some stand for decades. This is due (primarily) to the thickness of the steel.

Edit2: Product reviews are probably important when you can't get the actual specifications. Amazon has reviews for the example product that you linked... 3.5 stars is not so hot.

Answer from Ben Welborn on Stack Exchange
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Lowe's
lowes.com › home › diy projects & ideas › how-tos › outdoor living
How to Build a Fire Pit Ring
Set the metal fire pit ring inside the fire pit. Finish by filling the pit with lava rock up to the bottom of the metal ring insert.
Published   March 24, 2023
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Reddit
reddit.com › r/diy › fire pit ring
r/DIY on Reddit: Fire Pit Ring
October 10, 2023 -

Looking for some assistance on proper materials and execution. My family owns property where we have a cabin. We currently have a fire pit, but it doesn’t have a ring or stones around it. It’s just an area in the ground about 3 feet in diameter, some brick/stone (yes, the kind that withstands the heat) to demarcate the area. I was looking to get them a ring about 5-6 feet in diameter, but they’re fairly expensive. Any thoughts on how I can make one, buy the materials and have someone do it, or should I just pay the full price and have it made for me? Thanks!

Photo from Fire Pit Screens to depict what I’m describing.

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B&Q
diy.com › home › outdoor & garden › garden furniture › garden heating › fire pits
Round Fire Pit Ring Insert 2mm Steel
Comes in a large diameter, the ring can hold a load of wood that can keep the fire going. ... Round fire pit ideal for gathering 2 mm thickness steel for long-lasting durability Free for DIY Dimensions: 60cm Dia x 20cm H Material: Weathering Steel Finish: Black
Top answer
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(edit Most barrels...) won't last very long as fire pits. I know this from burning trash when I was a kid. By the time the barrel was full it was falling apart. I never counted, but I would expect it to work well for about 10-20 burns and maybe 50-60 burns before its paper thin and falling apart.

Edit: The thickness of the metal is what matters. 18 gauge drums are what I find to be the industry standard; 18 gauge won't last very long in my opinion. A thicker drum would last longer. I personally own a fire pit object that is very thin, which probably would not last more than 10 burns. So it goes to show that any ol' manufacturer may not necessarily make a decent product.

I have seen barrels converted to wood stoves. I have seen some of them fall apart and I have seen some stand for decades. This is due (primarily) to the thickness of the steel.

Edit2: Product reviews are probably important when you can't get the actual specifications. Amazon has reviews for the example product that you linked... 3.5 stars is not so hot.

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"what (are) the advantages of having one..." "to avoid direct heating of the surrounding rock/concrete"

Yes, the advantage is to reduce direct conductive and radiant heat transfer to the surrounding material. Heating clay bricks, rocks, stones, concrete, decorative bricks/pavers, etc. will cause them to crack and crumble. Sometimes immediately, sometimes over a period of time. Sometimes explosively and dangerously, due to moisture in the stone/clay/concrete (unless you use special refractory brick).

I agree with other comments and posts, a DIY job is fine but thicker steel/iron is the key to good performance. I would say 12 gauge would be minimum thickness.

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Pinterest
pinterest.com › explore › home decor › home accessories › fireplace › metal fire pit ring
Metal Fire Pit Ring
Metal Fire Pit Ring Ideas: Find nature-inspired cutouts and rustic charm for your backyard.
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Sunnydaze Decor
sunnydazedecor.com › home › sunnydaze fire pit rings & diy liners
Sunnydaze Fire Pit Rings & DIY Liners
A fire pit ring is a round or square metal ring that is placed around a campfire or fire pit. They are designed to keep your fire safely contained within the ring while you enjoy its warmth and ambiance. They can be used with a patio or backyard fire pit or you can pack them up and use them during your next camping trip. Our fire pit rims are made from durable materials and feature high-temperature paint for many years of use. ... Fire pit insert kits include everything you need to create a base for your own DIY custom fire pit.
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Bonfire By Design
bonfirebydesign.com › home › shop › smokeless fire pits › diy smokeless fire pit kit
DIY Smokeless Fire Ring Pit Kit | Bonfire By Design
August 31, 2023 - Insert the metal smokeless fire pit ring insert and ensure it sits flush on the ground and the lip is flush with the top blocks. Optional: Finish the hardscape fire ring with a cap. Add some chairs, start a fire, and enjoy a DIY smokeless fire pit with friends and family!
Find elsewhere
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Best Buy Canada
bestbuy.ca › en-ca › product › sunnydaze-30-in-heavy-duty-steel-above-in-ground-fire-pit-ring-insert › 16687071
Sunnydaze 30 in Heavy-Duty Steel Above/In-Ground Fire Pit Ring Insert | Best Buy Canada
Heavy-duty DIY outdoor fire pit rim insert. durable 2 mm thick steel construction with high-temperature paint finish. Includes 1 fire pit rim and hardware. Easy 4-piece assembly. Dimensions: 30" inside diameter/36" total outside diameter x 10" H. Features durable 2 mm thick steel construction; 1.5mm thick lip with high-temperature paint finish ... Place this fire pit ring into the ground for a lovely in-ground fire pit that is great for getting together with friends on cool fall nights or family events after a long, summer day.
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Vevor
vevor.ca › lawn & garden › patio furniture & accessories › charcoal fire pit
VEVOR 36-Inch Outer/30-Inch Inner Fire Pit Ring, Fire Pit Insert 3.0mm Thick Heavy Duty Solid Steel, Fire Pit Liner DIY Campfire Ring Above or In-Ground for Outdoor | VEVOR CA
VEVOR 36-Inch Outer/30-Inch Inner Fire Pit Ring, Fire Pit Insert 3.0mm Thick Heavy Duty Solid Steel, Fire Pit Liner DIY Campfire Ring Above or In-Ground for Outdoor
VEVOR Fire Pit Ring is a durable 36-inch steel fire pit liner with high-temp paint, perfect for DIY projects, camping, and creating uniform flames in any weather.
(4.7)
Price   $140.99
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YouTube
youtube.com › watch
How to build a fire pit/fire ring - YouTube
Subscribe to Patio Town's eLandscape newsletter to get coupons, tips, and learn about sales and new products. It's free, and you'll get a $10 coupon just for...
Published   February 22, 2013
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Hearth.com
hearth.com › forums › non-hearth forums › diy and general non-hearth advice
Lining a fire pit with sheet metal | Hearth.com Forums Home
June 26, 2017 - I want to build a fire pit with concrete blocks from Lowes. They sell a kit for $200 that includes 3 rows of pavers and a metal (black paint coated) fire ring https://www.lowes.com/pd/43-5-in-W-x-43-5-in-L-Ashland-Concrete-Firepit-Kit/4686367. This fire ring accounts for $100 of the overall price, and is only about 4 or 5 inches high and is designed to prevent the heat from the fire from cracking the top 4-5 inches of concrete block.
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Amazon
amazon.com › Sunnydaze-Liner-Ground-Outside-Inside › dp › B00P6U21PQ
Amazon.com: Sunnydaze Outdoor Fire Pit Ring - DIY Above or In-Ground Steel Fire Ring Insert - 42-Inch Outer/36-Inch Inner Diameter : Patio, Lawn & Garden
EASY TO ASSEMBLE: This large 4-piece metal fire pit liner insert is easy to put together and assembles in minutes (NOTE: There is no bottom to this fire pit liner). VERSATILE AND CUSTOMIZABLE: Whether building a rustic stone fire ring or a sleek modern setup, this fire pit kit provides a solid foundation. Because it can either be used in-ground or above-ground, it seamlessly fits a DIY ...
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Pinterest
pinterest.com › explore › diy and crafts › diy projects › diy fire ring ideas
Diy Fire Ring Ideas
Diy Fire Pit · Backyard Fire · Fuentes De Agua · Yard Work · Backyard Projects · Backyard Fun · Round Steel Metal Fire Pit Ring Liner Insert 45" Diameter X 14" Tall
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YouTube
youtube.com › watch
How To Build a Fire Pit (w/a Ring Kit) - YouTube
Watch to learn to build a quick and easy fire pit using a ring kit. Full project details on Lowes.com: http://low.es/2jwV8BW Subscribe to Lowe's YouTube: htt...
Published   January 20, 2017
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Ssfirepits
ssfirepits.com › home › fire pits that are guaranteed forever › custom steel fire pit insert
Custom Steel Fire Pit Insert – Custom Fire Pits | Unique Fire Pits | Guaranteed For Life
We also put a round base on the bottom of the pit so if you ever wanted to take it out, you have a free-standing fire pit, just in case you ever move, you can take it with you. Don’t forget the snuffer lid, we can custom-make one to fit right on top of your new steel insert.
Call   404-840-8474
Address   2411 Sullivan Rd. Unit B College Park Park, 30337
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Amazon
amazon.com › Fire-PIT-Steel-Ring-Insert › s
Amazon.com: Fire PIT Steel Ring Insert
Check each product page for other buying options. Price and other details may vary based on product size and color · SoulMate Outdoor 40-Inch Outer/36-Inch Inner Fire Pit Ring Smokeless,Duty Solid Metal Steel Round Firepit Rim Insert for DIY Fire Pits, Outdoor Above or In-Ground, Camping Garden ...
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Lawn Care Forum
lawnsite.com › home › forums › 🏞 landscape design & installation › hardscaping
Steel ring needed for fire pit? | Lawn Care Forum
Another option I was thinking of was just to put lava rock inside the pit, up to about 3" from the top. ... Mr. Midwest ... another option is firebrick. This is going to come with a higher labor cost but it gives it a professional look ... I built an unilock firering at my house and we cracked the block. So all my fire rings get them now