【Package Include】4pcs grinder bit 1 3/4 1/4 1/8 Inch; 4pcs M5 hexagonal wrench; diamond grit #140/170; total length 35/35/32mm; diamond height 18/16/18mm; inside diameter 8mm 【Application】Suitable for all kinds of glass, stained glass, tiles, stone, jade and other molding and grinding; very suitable for home use, is the handmade enthusiasts and designers of choice. When grinding, be sure to add water or coolant to use 【High Quality Material】The glass diamond grinder bits are made of quality copper material, the surface is plated with diamonds, the bonding surface is double-plated to ensure no peeling, high strength and long life 【Brazing Process】Adopting brazing process, high sharpness, improved working efficiency and longer service life. Stained ceramic glass abrasive tool adopts a standard frosted design, and the brass core reduces shaft binding and will not stick to the shaft of the grinder; The drill bit is chrome-plated and hardened to improve performance, strength and durability 【Recommended Machine】Suitable for most glass grinder. Maximum speed 4200RPM