HSS Center Drill centre drill A type B type 1.Material: Hard alloy,HSS6542,9341,4341, ... treatment: bright finish HSS Center Drill centre drill A type B type1.Material: Hard alloy,HSS6542,9341,4341,4241 ... treatment: bright finish 3.Size: A type 0.5-6.0 B type 1.0-6.34.Technicial:fully groundCenter ... of HSS products like end mills,center drill,drill bits and reamers.Wlecome to visit our factory for further ...