... ,9341,4341,4241 2.Surface treatment: bright finish HSS Center Drill centre drill A type B type1.Material: Hard alloy,HSS6542,9341 ... .0 B type 1.0-6.34.Technicial:fully groundCenter drill.Easy cutting with high speed and excellent offtake of chips ... like end mills,center drill,drill bits and reamers.Wlecome to visit our factory for further cooperation. HSS Center Drill centre drill A type B ...