Wokesi 4mm Cutting Dia,4mmShank Dia,100mmOAL,Extra Long,HRC45 4Flutes TiAlN Coated Solid Carbide Square End Mill CNC Router Bits Cutting Tools for Slotting Milling(4mmDia&times;4mmShank&times;100mmOAL) Cutting diameter:4mm Shank diameter:4mm Overall Length:100mm Material:Tungsten carbide,High quality TiAlN coating,getting long tool life. Suitable for process Copply,Alloy,Iron and Steel under HRC45(HRA73).High Performance High micro hardness,high abrasion resistance,good toughness. Package:1xEndmill Cutter