HSS Center Drill centre drill A type B type 1.Material: Hard alloy,HSS6542,9341,4341, ... ,HSS6542,9341,4341,4241 2.Surface treatment: bright finish 3.Size: A type 0.5-6.0 B type 1.0-6 ... like end mills,center drill,drill bits and reamers.Wlecome to visit our factory for further cooperation. HSS Center Drill centre ...