Irwin IR10313ZR Unibit Step Drill Bit 1-1/8 in

Product Description

The IRWIN IR10313ZR is a Type 13 UNIBIT step drill bit designed for drilling clean, sized holes in thin materials including sheet metal, plastic, and thin-gauge steel. Step drill bits are preferred by electricians, HVAC technicians, and plumbers when precise hole sizing is needed without multiple bit changes. This bit steps up progressively to a maximum diameter of 1-1/8 inches and is capable of producing a single finished hole per step. It is a standard tool-room and field-use bit suited for trade professionals working on panel knockouts, conduit entry points, and enclosure penetrations.

This step drill bit is used in residential and light commercial applications where clean, burr-reduced holes are required in thin substrates. Common install scenarios include electrical panel and junction box knockouts, HVAC sheet metal penetrations, and plumbing access holes through thin material. The Type 13 designation identifies the specific step geometry and size range of this UNIBIT configuration.

Key Features

• Steps up to a maximum diameter of 1-1/8 inches for sized hole drilling
• Type 13 UNIBIT step geometry for progressive hole sizing in a single tool
• Single-hole design produces one finished hole per operation
• Suitable for sheet metal, plastic, and thin-gauge materials common in trade work
• Eliminates need for multiple drill bit sizes in one stepped operation

Compatibility

Designed for use with standard drill drivers and drill presses accepting a compatible shank size. Suitable for drilling thin-gauge sheet metal, plastic panel stock, and similar thin materials typical in electrical, HVAC, and plumbing trade applications.

Installation Notes

Step drill bits are installed and used by licensed electricians, HVAC technicians, and plumbers. Always secure the workpiece before drilling and use appropriate eye protection. Apply moderate consistent pressure and allow the bit to step through material without forcing. Consult applicable NEC or trade-specific codes when sizing conduit or wiring penetrations.

Technical Specifications

• Type: 13 UNIBIT Step Drill
• Maximum Diameter: 1-1/8 inches
• Number of Holes: 1
• Unit of Measure: Each
• UPC: 038548103136

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: IR10313ZR