18pc Diamond-in-Rubber Emery Polishing Bit Set - Fits Dremel - Metal, Glass, Stone, Tile Unique emery rubber compound embedded industrial diamond particles, extra-fine, fine, medium grit Highly-effective at removing rust, corrosion, paint from metal and other hard material 18 bits in a variety of sizes, 6, 12, 20mm Less harsh than mounted stone or diamond-on-steel bits; leaves smooth, polished surface 1/8" shanks fits Dremel & other rotary tools - an amazingly versatile accessory set