Irwin 87920 Spade Blade Drill Bit 1-1/4 Inch Hss Hex

Product Description

The IRWIN 87920 is a spade blade drill bit designed for boring large-diameter holes in wood and wood composite materials. Built from high-speed steel (HSS) with a bright polished finish, it delivers clean entry cuts in residential and light commercial applications. The 1/4 inch hex shank seats securely in standard hex-drive chucks and quick-change bit holders. At 1-1/4 inches in diameter, this bit handles rough-in work for plumbing, electrical, and HVAC trades where oversized through-holes are required. The 4 inch shank length provides sufficient reach for typical framing and stud work without an extension.

This bit is suited for electricians, plumbers, and HVAC technicians drilling through wood framing, subfloor, and similar materials during rough-in installation. The two-spur design scores the perimeter of the hole before the center blade removes material, helping reduce tear-out on the exit face. It fits any 1/4 inch hex-drive drill or impact driver, making it a practical addition to a standard trade tool kit.

Key Features

• 1-1/4 inch cutting diameter for large-bore rough-in applications
• High-speed steel construction for durability through repeated use
• 1/4 inch hex shank compatible with standard hex-drive chucks and quick-change holders
• 4 inch shank length for reach in typical framing and stud drilling
• Two-spur tip design helps reduce exit-face tear-out
• Bright polished finish with no added coating

Compatibility

Designed for use with standard 1/4 inch hex-drive drills and impact drivers commonly used in electrical, plumbing, and HVAC rough-in work.

Installation Notes

This bit is installed and used by electricians, plumbers, and HVAC technicians during rough-in phases. Secure the hex shank fully in the chuck before operating. Keep drill speed appropriate for the material being drilled and maintain steady, even pressure to avoid deflection. Inspect the cutting edges before each use and replace the bit if spurs or the center blade show damage that could cause binding.