Feature: -Alloy electroplated diamond grinding rod mill. -Fine workmanship, easy sanding, durable. -Mainly used for grinding, mold processing and repair, stone carving child, carved, line cutting, grinding, engraving, jade carving, glass engraving, cleaning casting, forging, welding pieces of flash, burrs, weld. Teeth grinding. Various mechanical parts chamfering and groove processing. Pipe cleaning, the hole and surface finishing hinery parts. -Can be installed for use on electric grinder, engraving hine, pneumatic engraving pen. Specifications: Product name: Diamond Drill Material: Diamond Color: Silver Total length: Approx. 45mm/1.77inch; Grinding diameter: Approx. 5mm/0.19inch; Shank diameter: Approx. 3mm/0.11inch; Length of Grinding: Approx. 10mm/0.39inch; Quantity: 5pcs Package Include: 5x Diamond Drills