#3 Step Drill Bit, 1/4" - 3/4" by 1/16"

#3 Step Drill Bit (1/4"–3/4" by 1/16") — Overview

A #3 step drill bit (1/4" to 3/4" in 1/16" increments) is a tapered drill bit designed to cut multiple hole sizes with a single tool, instead of switching bits. Yours is the common “#3” size range used in sheet metal and fabrication work.

What it actually does

This bit starts at 1/4" and steps up in 1/16" increments all the way to 3/4", meaning one bit can drill multiple finished hole sizes like:

• 1/4"
• 5/16"
• 3/8"
• 7/16"
• 1/2"
• 9/16"
• 5/8"
• 11/16"
• 3/4"

Key Features

• Single-bit multi-size drilling – replaces many standard twist drill bits
• Titanium coating (usually TiN) – reduces friction and increases lifespan
• Two-flute spiral design – smoother cutting and better chip removal
• Self-centering tip – reduces walking on sheet metal
• Deburring effect – cleans edges as it cuts
• Works in metal, aluminum, plastic, wood, and thin sheet steel

Best Uses

• Electrical knockout holes in panels
• HVAC sheet metal work
• Enclosure and chassis fabrication
• Enlarging existing holes cleanly
• Thin materials (typically up to ~1/8"–1/4" steel depending on quality