Step Drill Bits

KnKut Step Drill Bits are built from special moly alloy steel with a gold surface treatment for maximum lubricity and heat resistance. The dual-flute design cuts clean, accurate holes in sheet metal, plastic, composite, and thin-gauge material in a single pass, no pilot hole, no chatter, no burrs. Each step is precision-ground so you get consistent sizing across the full range on a single bit. Also available in conduit knock-out (KO) configurations for electrical panel and enclosure work. The KnKut Hole Expansion Step Reamers in this category enlarge and deburr existing holes up to 1/2" thick with a 90° notch design and 3/8" shank. A go-to for auto fabricators, HVAC installers, electricians, and anyone doing sheet metal work. USA made.

Working thin-gauge sheet metal? Our Double End Drill Bits are built for it. Need to true or enlarge a hole? See our Car Reamers.