3Pcs Steel Titanium Step Drill Bit Hole Drilling Tool 4" Shank Quick Change

Features:
1.100% new brand and high quality.
2.Unique ladder structure, 1/4 shank. Straight grooves.
3.Automatically Deburrs Holes as you Drill. Two-flute design makes faster, smoother .
4.Titanium Nitride Coating for Cooler Running, can effectively extend the service life of the drill bit.
5.Suitable for carbon steel plate, sheet iron, insulation boards, wood. Cannot be used for stainless steel.
6.A great helper for Carpenter.
7.Suitable for a variety of specifications.
8.Doing wel in chamfer, removing, archimedean drill, trepanning.
9.Used in the workpiece whose hardness is under 25.

Specification:
1.Material:HSS 4241
2.Shank :1/4 Hexagonal shank 3/8 Round Shank
3.Surface treatment: titanium
4.Tools: drill, bench drill.

3/16-1/2 :
3/16（4.76mm), 1/4(6.35mm）, 5/16(7.94mm), 3/8(10.35mm), 7/16(11.11mm), 1/2(12.7mm)

1/4-3/4:
1/4(6.35mm) 5/16(7.94mm), 3/8(10.35mm), 7/16(11.11mm),1/2(12.7mm）,9/16(14.28mm), 5/8(15.88mm), 11/16(17.46mm), 3/4(19.05mm)

1/8-1/2 :
1/8（3.18mm), 5/32(3.97mm), 3/16（4.76mm), 7/32,(5.56mm)，1/4（6.35mm),9/32(7.14mm), 5/16(7.94mm), 11/32(8.73mm), 3/8(9.53mm),13/32(10.32mm),7/16(11.11mm),15/32(11.91mm),1/2(12.7mm）

Package included:
1X Drills Set(3pcs)









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