Spherical Head Diamond Grinding Bit Round Ball Lapidary Rotary Tool 6/8mm Shank Features: Material: Metal, Diamond Head Diameter: 6mm/8mm/10mm/12mm/14mm/16mm/18mm/20mm/25mm/30mm/35mm/40mm/45mm/50mm Shank Diameter: 6mm/1/8Inch 8mm Grit：Coarse / Fine Color: Silver Scope of application: Can be installed on electric grinders, engraving machines, and pneumatic engraving pens for use. This product uses high-quality artificial diamond as raw material, with exquisite craftsmanship. It is made of high-strength diamond and high-quality body through electroplating, and is reliable in quality. It is used for the assembly of electric grinding machines, engraving machines, and electrical machinery.