Irwin 1890721 Straight Shank Installer Wood Drill Bit

Product Description

The IRWIN 1890721 is a straight shank installer drill bit designed for boring through wood framing and structural members during low-voltage wiring, cable, or conduit installation. The straight shank design allows it to seat directly in standard drill chucks without adapters. At 3/8 inch in diameter and 3 inches in length, it is sized for routing wires and cables through typical residential and light commercial framing. Electricians, HVAC installers, and low-voltage technicians rely on this bit type when running wire through joists, studs, and top plates.

This installer bit is suited for wood-frame construction where penetrations must be drilled quickly and cleanly for wire or cable passage. It is a standard single-piece tool used in residential and light commercial applications. The 3/8 inch diameter is a common size for routing communication cable, thermostat wire, and control wiring through framing lumber without requiring oversized clearance holes.

Key Features

• Straight shank seats in standard 3-jaw drill chucks without adapters
• 3/8 inch diameter sized for wire and cable routing penetrations
• 3 inch length suited for drilling through standard dimensional lumber
• Designed for installer applications in wood-frame construction
• Sold as a single unit for individual replacement or tool inventory

Compatibility

Designed as a standard straight shank installer drill bit compatible with any drill accepting a 3/8 inch or larger keyed or keyless chuck.

Installation Notes

This bit is installed and used by electricians, HVAC technicians, and low-voltage installers drilling wire-routing holes through wood framing. Ensure the drill is powered off and chuck is fully secured before beginning work. Follow NEC and local code requirements for minimum clearance between drilled holes and the edge of framing members when routing electrical conductors. Wear appropriate eye protection during drilling operations.