Klein Tools KTSB11 2-Step Drill Bit, 3/8-Inch Hex, Double Straight Flute, 7/8-Inch to 1-1/8-Inch Best Choice

Straight, Double Fluted Step Drill Bits from Klein Tools provide cleaner cutting and drilling. The aluminum titanium coating is 10 times more durable than steamed black oxide for longer bit life. 3/8-Inch hex shank is durable, and has a firm, positive grip. Laser-etched markings provide quick size identification on primary holes. This step bit has 2-hole sizes from 7/8-Inch to 1-1/8-Inch (22.2 to 28.6 mm).