Irwin 10233 Unibit Step Drill Bit Set 9 Steps

Product Description

The IRWIN 10233 is a Unibit step drill bit set designed for drilling clean, accurate holes in sheet metal, plastic, and thin-gauge materials. The set covers 9 hole sizes ranging from 1/4 inch to 3/4 inch, giving technicians a single tool to handle a wide range of opening sizes without swapping bits. The 3/8 inch shank fits standard drill chucks commonly found on corded and cordless drills used in HVAC, electrical, and plumbing rough-in work. Electricians and HVAC installers rely on step drill bits for punching knock-outs and conduit openings in electrical enclosures and sheet metal ductwork.

This step drill bit set is suited for light commercial and residential trade work where clean, burr-free holes are required in thin materials. Common applications include drilling wire and conduit pass-throughs in electrical panels and junction boxes, creating drain and supply line openings in sheet metal, and punching holes in HVAC equipment panels. The 9-step design allows a single bit to cover multiple diameters, reducing the number of tools needed on a service call or installation job.

Key Features

• 9-step design covers hole sizes from 1/4 inch to 3/4 inch in a single bit
• 3/8 inch shank fits standard drill chucks on corded and cordless drills
• Step geometry produces clean, accurate holes in sheet metal and plastic with minimal burring
• Compact set reduces toolbox clutter for field technicians
• Suitable for electrical, HVAC, and plumbing sheet metal applications

Compatibility

Designed for use with standard 3/8 inch or larger drill chucks on corded and cordless drills. Appropriate for drilling thin-gauge sheet metal, plastic, and similar materials typical in electrical, HVAC, and plumbing trade installations.

Installation Notes

Step drill bits are typically used by electricians, HVAC technicians, and plumbers during rough-in and equipment installation. Always de-energize electrical panels and equipment before drilling near live components, following NFPA 70 (NEC) lockout/tagout procedures. Use light, consistent pressure to allow the step geometry to self-center and prevent bit walking. Safety glasses and appropriate hand protection should be worn when drilling sheet metal.

Technical Specifications

• Hole Size Range: 1/4 inch to 3/4 inch
• Number of Steps: 9
• Shank Size: 3/8 inch
• Weight: 1.063 pounds
• UPC: 038548101033

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: 10233