5pcs fully ground HSS step drill bits set

5pcs fully ground Hss Step Drill Bits set 1.Size in Set: 1)Metric 4-12,4-20,5-28,4-30,4-39; 4-12,4-12,6-18,4-22,6-35; 3-12,4-12,4-20,4-32,4-39; 2)Inch: 3/16-1/2;1/8-1/2;1/4-3/4;3/16-7/8;1/4-3/8 Other sizes in set that according to your requirement are available Single hss step drill bit is available. 2..PACKING:wooden box,aluminum box,then in export carton 3.Material:High Speed Steel 4241,4341,m2,m35 4.Flute:,Straight,Spiral flute. 5.Shank:Straight shank,we can also supply