Dophee 8pcs 50mm 2" Diamond Cutting Discs Cut Off Blade Wheels Arbors Set Rotary Tool 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: 50mm. Disc Thickness: 0.5-0.6mm. Arbor Shaft Length: 38mm. Arbor Shaft Diameter At Top: 4.5mm. Arbor Shaft Diameter At Bottom: 3mm. Material: Diamond.