Atoplee 3pcs Titanium Coated Step Drill Bits 1/4 inch HSS Hex Shank,4-32mm 4-20mm 4-12mm Material:HSS 4241 Surface treatment: Ti;Shaft Type: Hex Shank Handle Length:7.1mm ; The clamping handle shape: 6 Type: 4-32mm 4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm; 4-20mm4,6,8,10,12,14,16,18,20mm) ;4-12mm4,6,8,10,12mm) Package Included: 3pcs stepped drills