Cylindrical diamond coated head.Can be installed on the electronic mill, hanging mill and hand drill (not included here).Used for sculpting, dressing, precision grinding and internal grinding of cemented carbide in ceramics, glass, gemstone, alloy and many ther abrasive materials.Product Name: Diamond Grinding PenTip shape: cylinderMaterial: metal, diamond layered headHead diameter : 10mm / 0.4 inchHead length: 20mm / 0.8 inch diameter : 6mm / 0.24 inch length: 60mm / 2,4 inchColor: silver toneWeight: 42gPackage content:2 x diamond grinding pinOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.