... ,4341,4241 2.Surface treatment: bright finish HSS Center Drill centre drill A type B type1.Material: Hard alloy,HSS6542,9341,4341,4241 ... finish 3.Size: A type 0.5-6.0 B type 1.0-6.34.Technicial:fully groundCenter drill.Easy cutting with high ... 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 type