Step Drill Bit 1/4"–1-3/8" (Model KTSB15)

Achieve clean, precise holes without changing bits—this heavy-duty step drill bit covers everything from 1/4″ up to 1-3/8″ in one tool. Dual straight flutes optimize chip removal for smooth, burr-free edges, while the fast-starting, non-walking tip ensures you hit your mark every time. Built for professionals, it’s engineered from M2 high-speed steel and finished with aluminum titanium nitride for exceptional wear resistance.

Designed to fit any standard drill, the thick 3/8″ hex shank locks securely into your chuck to prevent slipping. Laser-etched step markings make size selection quick and foolproof, and the versatile design tackles steel (up to 16 ga.), wood, plastic and aluminum with ease. Whether you’re running conduit, installing speakers or fabricating panels, this step bit streamlines your workflow.

Key Features

• Aluminum titanium nitride (AlTiN) coating for up to 10× longer bit life than black oxide
• Dual straight flutes for rapid chip evacuation and cleaner cuts
• Thick 3/8″ hex shank prevents slipping and provides positive grip
• Laser-etched, high-visibility step markings for quick size identification
• Fast-starting, non-walking tip for precise pilot hole placement
• One-piece bit covers hole sizes from 1/4″ to 1-3/8″ (6.35 mm–34.9 mm)
• Ideal for steel (up to 16 ga.), wood, plastic and aluminum

⚠️ WARNING: Cancer and Reproductive Harm - For more information, visit www.P65Warnings.ca.gov.