Irwin IR10221 Step Drill Bit Set 13/16 to 1-3/8 Inch

Product Description

The IRWIN IR10221 is a step drill bit set designed for cutting clean, precise holes in sheet metal, plastic, and thin-stock materials up to 1/8 inch thick. The set covers a diameter range from 13/16 inch up to 1-3/8 inch in 1/16 inch increments, giving technicians 10 graduated steps in a single bit. The 1/2 inch shank fits standard three-jaw chucks on corded and cordless drills. This tool is well suited for electricians, HVAC installers, and plumbers who need to punch through enclosures, panels, and thin pipe fittings on the job.

Step drill bits in this size range are commonly used in light commercial and residential work where knockout punches are impractical or unavailable. Typical applications include drilling conduit knockouts in electrical enclosures, enlarging existing holes in sheet metal ductwork, and creating clean pass-throughs in thin plastic junction boxes. The graduated step design eliminates the need to change bits when stepping through multiple hole diameters in a single material.

Key Features

• Diameter range: 13/16 inch to 1-3/8 inch in 1/16 inch steps
• 10 graduated steps in a single bit body
• 1/2 inch shank for compatibility with standard drill chucks
• Rated for material thickness up to 1/8 inch
• Single bit replaces multiple standard twist drill sizes in the covered range

Compatibility

Designed for use with standard 1/2 inch three-jaw drill chucks on corded and cordless drills. Suitable for sheet metal, thin plastic, and similar light-gauge materials up to 1/8 inch thick.

Installation Notes

Step drill bits in this range are typically installed and used by electricians, HVAC technicians, and plumbers during rough-in and panel work. Secure the workpiece firmly before drilling and use appropriate eye protection. Apply steady, moderate pressure and allow the stepped geometry to guide the bit through the material without forcing. Ensure the drill chuck is fully tightened onto the 1/2 inch shank before operation.

Technical Specifications

• Minimum Diameter: 13/16 inch
• Maximum Diameter: 1-3/8 inch
• Incremental Step Size: 1/16 inch
• Number of Steps: 10
• Shank Diameter: 1/2 inch
• Maximum Material Thickness: 1/8 inch
• UPC: 038548102214

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: IR10221