Wokesi 4mm 6mm Cutting Dia,Suqare Nose End Mill,and Ball Nose End Mill Set,Pack of 4Pcs,HRC45,TiAlN Coated,Solid Tungsten Carbide,CNC Lathe Router Bits Cutting Milling Tools (4mm+6mm HRC45) 1.Contains:2pcSquare endmill(4mm DIA+6mm Blade Diameter),and 2pcBall Endmill(4mm +6mmBlade Diameter) 2.Material:Tungsten carbide,High quality TiAlN coating,Long service time. 3.Suitable for process Copper,Alloy,Iron and Steel under HRC45. 4.High micro hardness,high abrasion resistance,good toughness. 5.Package:2pcSquare endmills,2pcBall nose endmills