PRECISE CUTTING: This 6 piece diamond cutting disc set ensures precise cutting of hard materials such as glass, metal and stone. HIGH SPEED: Suitable for use with a 3.2mm collet, the discs can operate up to a maximum speed of 18, 000 rpm. CONTAINS: 4 x 16mm diameter diamond cutting discs, 2 x 19mm diameter diamond cutting discs, 2 x 3mm (1/8") shank mandrel.