This kit is suitable for all rotary tools that take a 1/8" Shank mandrel. Diamond Tipped Vented Cutting Disc. Set includes: 4 x Diamond Tipped Cutting Discs 20mm diameter. 2 x Diamond Tipped Cutting Discs 22mm diameter. 2 x 1/8" Shank Mandrel. Max speed 30,000rpm. Very useful consumable. Suitable for cutting glass, metal, stone etc...