Irwin IR43805 Hex Shank Drill Extension 18 Inch

Product Description

The IRWIN IR43805 is a heavy-duty hex shank drill extension designed for use with auger-style drill bits in deep-bore applications. It features a 5/16-inch hex tool end and a 23/64-inch straight mounting end, with an overall length of 18 inches to reach into wall cavities, framing lumber, and other confined spaces. The extension is secured by a double set screw mechanism for a firm, slip-resistant connection during high-torque drilling. Electricians and carpenters commonly reach for this type of extension when running wire or driving long auger bits through structural members where a standard drill chuck cannot reach.

This drill extension is suited for residential and light commercial rough-in work, particularly where long auger bits must be driven through plates, joists, or studs. It allows a minimum hole diameter of 11/16 inch to pass through on extension, making it practical for drilling clearance holes for conduit, cable, or pipe. The hex tool end provides positive engagement with compatible hex-shank auger bits, reducing bit walkout during extended drilling runs.

Key Features

• 18-inch overall length extends reach into wall cavities and deep framing members
• 5/16-inch hex tool end accepts standard hex-shank auger bits
• 23/64-inch straight mounting end for chuck or driver connection
• Heavy-duty double set screw locks bit securely during high-torque operation
• Minimum hole diameter of 11/16 inch passes through the extension body

Compatibility

Designed for use with 5/16-inch hex-shank auger drill bits in standard drill chucks or hex-drive adapters. Suitable for residential and light commercial drilling applications requiring extended reach.

Installation Notes

This extension is installed by inserting the straight mounting end into the drill chuck and tightening the chuck firmly before use. The bit is secured into the hex tool end via the double set screw using the appropriate hex key before beginning drilling. Always verify the set screw is fully seated and the bit is locked before applying power to the drill. Follow applicable OSHA hand and power tool safety guidelines when operating in overhead or confined-space environments.

Technical Specifications

• Tool End Size: 5/16 inches (hex)
• Mounting End Size: 23/64 inches (straight)
• Overall Length: 18 inches
• Minimum Pass-Through Hole Diameter: 11/16 inches
• Bit Retention: Heavy-duty double set screw
• Unit of Measure: Each

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: IR43805