Irwin IR10311ZR Step Drill Bit 11-7/8 in 1 Hole

Product Description

The IRWIN IR10311ZR is a step drill bit designed for creating clean, precise holes in sheet metal, thin steel, aluminum, and similar materials. Step drill bits allow a single tool to drill multiple hole sizes in one operation, reducing the need to swap bits mid-task. The IR10311ZR is sized at 11-7/8 inches and is sold as an individual bit. Electricians, HVAC technicians, and plumbers commonly use step drill bits when punching knockout holes in electrical enclosures, duct panels, and sheet metal fittings where a standard twist bit would not provide a clean finished edge.

This bit is suited for use in residential and light commercial trade applications where drilling through thin-gauge sheet metal or plastic panels is required. It is a single-hole configuration, making it a focused tool for a specific hole-size range rather than a multi-step progression set. Installers working on electrical boxes, control panels, HVAC equipment cabinets, and similar thin-material assemblies will find this bit applicable to common field drilling tasks.

Key Features

• Step drill design cuts clean holes in sheet metal and thin stock without a pilot hole in most applications
• 11-7/8 inch overall length suits standard drill chucks and extended-reach applications
• Single-hole configuration for targeted, repeatable hole sizing
• Sold individually (each) for targeted replacement or addition to an existing bit set

Compatibility

Designed as an OEM-style step drill bit replacement or addition for trade use in sheet metal, electrical, HVAC, and plumbing panel work requiring precise hole sizing in thin-gauge materials.

Installation Notes

Step drill bits are typically used by electricians, HVAC technicians, and plumbers and require a standard corded or cordless drill with a compatible chuck size. Always confirm the workpiece is secured and de-energized before drilling into any electrical enclosure or live equipment panel. Use appropriate cutting speed for the material to prevent bit overheating and maintain a clean cut edge. Eye protection and appropriate PPE are required when drilling metal.

Technical Specifications

• Size: 11-7/8 inches
• Number of Holes: 1
• UPC: 038548103112
• Unit of Measure: Each
• Minimum Order Quantity: 1

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: IR10311ZR