Buy a 3" angle grinder. More on reddit.com

Any one know of a 75mm or 3 inch ... and 4.5 inch grinders just a little cumbersome. Corded or cordless. don’t have a air compressor and I ain’t a dremmel fan plus don’t think it be gutsy enough for this application. ... Die grinder territory , hard to go past Dynabrade , just a wee tad spendy though. But when the hurt is over they are mighty versatile , you wonder how you ever got by without a few of them , either straight , angled or 90 degree ... More on mig-welding.co.uk

Everyone has their own opinions on grinders, so take mine with a grain of salt. 4.5/5" grinders are by far the most common. However I find myself using a 6" grinder more often. However, I don't think I would be happy with ONLY a 6" grinder, because many attachments (wire wheels, cup wheels, diamond grinding wheels, etc) will only fit a 4.5" grinder. So if I were to only get one, I would probably go with a 5"/125mm grinder. A 5" cutting or grinding wheel really does make a noticeable difference vs. a 4.5 wheel. There are very few times where you would really use a variable speed grinder. Such as polishing stone/concrete. Even then, you could probably get away with a full speed grinder and be easy, or ghetto mount the polisher to a drill, etc. Overall, I don't think variable speed grinders are worth their price premium. When using the grinder for the most common tasks (grinding, wire wheel, cutting) you definitely want full speed, I don't see any benefit to doing any of those tasks at less than full speed. I think you should have at least 6 amps (800W) of power. 8+ amps is preferable. I use 14A grinders exclusively and love the extra power. I'm a big fan of paddle handle grinders, but again, to each their own. Locking paddle handles are kind of the best of both worlds, but they're not very common due to OSHA requirements. More on reddit.com

I wrote some notes on the different models. Hope this helps some DCG405 - 20V MAX XR, brushless DCG409 - 20V MAX XR, flexvolt advantage, brushless DCG412 - 20V MAX, brushed DCG413 - 20V MAX XR, Brushless DCG414 - 60V FLEXVOLT, brushless 4.5 to 6" DCG415 - 20V MAX XR, power detect, brushless , 4.5 to 5" DCG416 - 20V FLEXVOLT Advantage, brushless, 4.5 to 5" DCG418 - 60V flexvolt, 4.5 to 6" (2nd generation) DCG440 - 60V flexvolt 7" DCG460 60V flexvolt 7 to 9" More on reddit.com