Have a look at the bits here. Not exhaustive in terms of what's available - I've seen a much better Dremel chart on here explaining all available bits,but this will help. The bits aren't bad either. link In terms of what do I prefer, it depends on what material I'm working with. I found that the diamond bits (designed for engraving) are actually quite good at shaping wood and cork, giving a neater finish that the carbide milling bits. I like using cutoff wheels for cutting plastic and sanding bobbins are great for finishing / smoothing. For enlarging holes in plastic, a cutting drill bit is also effective. Answer from Rob_of_bristol on reddit.com