OCR1/8" Carbon steel Diamond Saw Cut Off Discs Wheel Blades Rotary Tool Set Shank for Dremel (10Pcs) Size:16mm (1Piece)/ 19mm (2 Pieces)/ 20mm (1 Piece)/ 22mm (2 Pieces)/ 25mm (2 Pieces)/ 30mm (1 Piece)/ 40mm (1 Piece) Ideal For Cutting: Gem stones, metal, glass, carbide and other hard material. With high hardness and wear resistance and excellent impact resistance. 7pc Solid Wheels,3pc Holed Wheels Suitable for use in carpentry and crafts.