Irwin 87914 Spade Drill Bit 7/8 Inch Hex Shank Hss

Product Description

The IRWIN 87914 is a 7/8 inch spade-blade drill bit designed for boring large-diameter holes through wood and wood-composite materials. Built from high-speed steel with a bright finish, it delivers clean, repeatable cuts in framing, rough-in, and finish carpentry applications. The 1/4 inch hex shank seats securely in standard quick-change drill chucks and impact drivers, reducing slippage under load. With a 4 inch shank length, the bit provides adequate reach for drilling through dimensional lumber and single-layer subfloor. Electricians and plumbers rely on this style of bit for wire and pipe rough-in work where speed and hole size matter more than finish quality.

This bit is suited for residential and light commercial rough-in tasks where a 7/8 inch hole diameter is required. Common applications include drilling through wall plates and floor joists for electrical conduit, cable runs, plumbing supply lines, and low-voltage wiring. The hex shank makes it compatible with cordless drill drivers and impact-rated hex chucks, which are standard on most job sites. Its compact package size makes it easy to carry in a tool bag as a single replacement or spare.

Key Features

• 7/8 inch cutting diameter for large rough-in hole boring
• High-speed steel construction for durability through wood and wood composites
• 1/4 inch hex shank compatible with quick-change and impact-rated drill chucks
• 4 inch shank length provides reach through dimensional lumber
• Two-spur tip geometry for improved hole entry and cleaner edge cuts
• Bright finish — no coating buildup that can affect tolerance in tight fits

Compatibility

Designed as a direct-fit spade bit for any drill driver or impact driver accepting a standard 1/4 inch hex shank, including quick-change chuck systems common in residential and commercial rough-in work.

Installation Notes

Electricians and plumbers typically install this bit during rough-in phases before drywall. Ensure the drill is set to an appropriate speed for the material being drilled — lower RPM for thicker or harder wood reduces bit wear. Confirm the hex shank is fully seated and locked in the chuck before drilling. Always verify there are no hidden fasteners, pipes, or live conductors behind the work surface before boring.