Irwin 87924 Spade Bit 1-1/2 Inch Hex Shank Hss

Product Description

The IRWIN 87924 is a spade-blade drill bit engineered for boring large-diameter holes through wood framing, subflooring, and structural lumber. The bit measures 1-1/2 inches in cutting diameter and features a 1/4-inch hex shank for quick-chuck compatibility with standard cordless drills and impact drivers. Constructed from high-speed steel (HSS) with a bright finish, the 87924 delivers consistent cutting performance on rough-in and finish carpentry tasks. A 4-inch shank length provides reach in tight framing bays. The two-spur tip design scores the wood perimeter before the paddle clears the waste, reducing tear-out on exit. Electricians, plumbers, and HVAC installers use this bit when running conduit, pipe, or flex duct through wood framing members.

This spade bit is suited for residential and light commercial applications where large-diameter holes are needed in wood substrates. Typical installations include boring through wall plates and floor joists for pipe, wire, or duct passage. The 1/4-inch hex shank accepts any standard quick-release bit holder, making it compatible with the drill-and-drive setups common on jobsites. The bright HSS construction handles softwood and hardwood framing without the added cost of coated specialty bits.

Key Features

• 1-1/2-inch cutting diameter for large-bore rough-in work
• 1/4-inch hex shank fits standard quick-release chucks and bit holders
• 4-inch shank length for reach in framing cavities
• High-speed steel construction for durability across softwood and hardwood
• Two-spur tip design reduces tear-out and improves hole accuracy
• Bright finish — no coating buildup to affect cutting clearance

Compatibility

Designed as a standard replacement or add-on spade bit for use with any 1/4-inch hex quick-release drill chuck or bit holder on cordless and corded drills and impact drivers.

Installation Notes

Installation of this bit is performed by electricians, plumbers, HVAC technicians, and general contractors during rough-in phases. Ensure the drill or driver is set to an appropriate speed for the wood species being drilled — lower speeds suit dense hardwood. Confirm that no live wires, gas lines, or water lines run behind the drilling surface before boring. Always wear eye protection, as spade bits can eject wood chips at high velocity.