Irwin 87912 3/4 Inch Spade Drill Bit Hex Shank Hss

Product Description

The IRWIN 87912 is a 3/4 inch spade-blade drill bit designed for boring large-diameter holes through wood framing, sheathing, and similar materials. Built from high-speed steel with a bright finish, it delivers reliable cutting performance in demanding jobsite conditions. The 1/4 inch hex shank seats directly into standard hex-chuck drills and impact-ready drivers without a separate adapter. With a 4 inch shank length, the bit provides adequate reach for typical rough-in and finish boring tasks. Electricians and plumbers rely on this type of bit when running conduit, pipe, or wire through structural members.

The 87912 is suited for residential and light commercial applications where a standard 3/4 inch bore is required. Typical use cases include drilling through wall plates, floor joists, and studs during electrical rough-in, plumbing rough-in, and low-voltage cabling installations. The hex shank design makes it compatible with corded drills, cordless drills, and hex-chuck impact drivers, giving field technicians flexibility on the tool side without changing bits.

Key Features

• 3/4 inch cutting diameter for standard rough-in bore sizes
• High-speed steel construction for durability through repeated use
• 1/4 inch hex shank fits standard hex-chuck and quick-change systems
• 4 inch shank length provides reach through typical framing members
• Two-spur tip geometry for cleaner entry and reduced tear-out
• Bright finish with no coating buildup that could affect bit diameter tolerance

Compatibility

Designed as an OEM-style spade drill bit suitable for use with standard 1/4 inch hex-chuck drills and impact drivers commonly used in electrical, plumbing, and low-voltage trade applications.

Installation Notes

Seat the hex shank fully into the chuck before drilling to prevent slippage and bit wobble. When boring through framing near electrical or plumbing lines, follow NEC and IPC clearance requirements for drilling near existing services. Use a backer board when possible to reduce exit-side tear-out on finish surfaces. Inspect the bit for tip damage or heat discoloration before each use, and replace if the spurs are chipped or worn.