(6) PACK Diamond Plated Cutting Cut-off Wheels #545 dia. 7/8" - with Mandrel #402 DREMEL PROXXON Completely coated with fine diamond particles for working with hard materials. BIT DIAMETER: 7/8" (22 mm) SHANK DIAMETER: 1/8 (3.2 mm) THICKNESS: .024" (0.64 mm)