Brand: HARDEN

Model: 614173

HARDEN metal step drill bits set 3 pcs.

Set include:  *1/8″-1/2″  drill bit, steps: 1/8, 5/32, 5/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 13/32, 7/16, 15/32, 1/2 *3/16″-1/25″ drill bit, steps: 3/16, 1/4, 5/16, 3/8, 7/16, 1/2 *1/4″-3/4″ drill bit, steps: 1/4, 3/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4

Made of HSS high speed steel, coated with titanium to increase the lifetime of the drills 

The edges of the drilled hole remain clean and burr-free

Quick heat dissipation during drilling in hard materials

2 spiral chip grooves for efficient dust removal

Standard hex fitting for quick replacement using bit holders