Dophee 10pcs Mini Diamond Coated Cutting Off Discs Fit Rotary Tool for Dremel Drill (16mm) Great tools for DIY, craft work, jewelry making or silver smithing. These discs are super thin making them perfect for making slots and slits. These discs are coated on both sides as well as around the edge. Ideal For Cutting: Gem stones, metal, glass, ceramics, porcelain, tiles, carbide, rocks. Disc Diameter: 16mm. Disc Thickness: 0.5-0.6mm. Arbor Shaft Diameter At Top: 4.5mm. Arbor Shaft Diameter At Bottom: 3mm. Arbor Shaft Length: 38mm Material: Diamond.