Irwin 87916 Spade Blade Drill Bit 1 Inch Hss Hex Shank

Product Description

The IRWIN 87916 is a 1-inch spade blade drill bit designed for fast, aggressive boring in wood and wood-composite materials. It is constructed from high-speed steel (HSS) with a bright finish and features a 1/4-inch hex shank that seats securely in impact drivers and standard drill chucks. The 4-inch shank length provides reach for framing, rough-in drilling, and similar structural applications. With two spurs on the cutting head, the bit scores the material perimeter before the main cutting edge engages, producing a cleaner entry hole. Electricians, plumbers, and general contractors reach for spade bits during rough-in work where speed matters more than a finished edge.

This bit is suited for residential and light commercial rough-in applications — running conduit, drilling joist bays for plumbing lines, or boring through wall plates for low-voltage wiring. The 1/4-inch hex shank is compatible with quick-change bit holders, making it practical on the job site where bit swaps need to happen fast. The 1-inch cutting diameter is a common size for single-run conduit pass-throughs and standard plumbing stub-out clearance holes.

Key Features

• 1-inch cutting diameter for common rough-in bore sizes
• High-speed steel construction for durability through repeated use
• 1/4-inch hex shank seats in quick-change holders and standard chucks
• 4-inch shank length provides reach for framing and structural members
• Two-spur cutting head scores material perimeter for cleaner entry
• Bright finish with no coating buildup that could affect dimensional tolerance

Compatibility

Designed as a standard spade blade drill bit compatible with any drill or impact driver accepting a 1/4-inch hex shank, including quick-change bit holder systems.

Installation Notes

Spade bits are installed by electricians, plumbers, and carpenters during rough-in phases; confirm the driver or drill is rated for the bit diameter before use. Secure the workpiece before drilling and back the bit out periodically to clear chips in deep bores. When drilling near structural members, follow applicable building codes for maximum allowable hole size and placement. Always wear appropriate eye protection when operating rotary cutting tools.