Description: Drillpro DB-S4 HSS Titanium Pagoda Drill/Ladder Drill 1/4 & 3/8 &1/2 Inch Round Shank Step Drill Bits Specifications: Brand: Drillpro Model: DB-S4 Material: HSS 4241  Surface treatment: Titanium Tools: Pagoda drill, Bench drill. Material:HSS 4241     Shank :1/4" & 3/8" Round Shank Quantity: 1pc Size: 3/16-1/2''---3/16,1/4,5/16,3/8,7/16,1/2 (inch) -- 6.35mm (1/4”) Shank   1/8-1/2''---1/8,5/32,7/32,1/4,9/32,5/16,11/32,3/8,13/32,7/16,15/32,1/2 (inch) --  6.35mm (1/4” )Shank   1/4-3/4''---1/4,5/16,3/8,7/16,1/2,9/16,5/8,11/16,3/4  (inch) -- 9.53mm (3/8") Shank   3/16-7/8''---3/16,1/4,5/16,3/8,7/16,1/2,9/16,5/8,11/16,3/4,13/16,7/8 (inch) -- 9.53mm (3/8") Shank   1/4-1-3/8''---1/4,3/8,1/2,5/8,3/4,7/8,1,1-1/8,1-1/4,1-3/8 (inch)  -- 12.7mm (1/2") Shank     Features: 1.Unique ladder structure,  round shank. Straight grooves. 2.Automatically De-burrs Holes as you Drill. Two-flute Design Gives You Faster & Smoother Cutting. 3.Titanium Nitride Coating for Cooler Running, and can effectively extend the service life of the drill bit. 4.Suitable for carbon steel plate, sheet iron, steel plate, insulation boards, wood. Cannot be used for stainless steel. Suitable for the workpiece 25 ° or less .    Package Includes: 1x Step Drill Bit