: Material : matter carbide -LRB- Tungsten steel -RRB- Shank diameter : 3.175 mm / 0.125 inch thinning edge diameter : 1.5 mm thinning edge length : 9 mm add up length : approx. 37.00 ± 0.20 mm Features : These etching bits have comfortable flexural strength and wear resistance Milling, hole and plate edge, surface remove, neaten, no burr Made from ultra-fine grain carbide material which of unspoiled milling properties to ensure efficacious work A Wide Range of Materials can be engraved, including : Circuit boards, Metal, Majority of plastics, Wood, SMT, Fibre glass, Carbon,FR-4, CEM-3 board and situation board Package included : 10Pcs Carbide End Mill etching Bits 1.5 mm .