Precision grind for quick, easy sharpening of chain saw blades,High working efficiency, perfect grinding effect and long using life. Shank size:1/8inch (3mm)，Total length: 44mm Head diameter: 4mm/ 5mm/ 6mm/ 8mm/ 10mm Material: Chrome corundum(FUSED ZIRCONIA ALUMINA),Shape: Flat head cylindrical, bullet tip type