... ,straight shank. HSS zero Flute Countersinks&Deburring Tools ,According to DID standard ,straight shank&taper shank4pcs/set:2-5,5-10,10-15 ... ,15-20mm,with metal case5pcs/set:1-4,2-5,5-10,10-15,15-20mm ... ,with wooden box6pcs/set:2-5,5-10,10-15,15-20,20-25 ... ,25-30mm with wooden box5pcs/set:0#,1#,2#,3#,4# with wooden box8pcs/set:0#,1#,2#,3#,4#,5 ...