Irwin 88708 Spade Blade Drill Bit 1/2 in 16 in Hss

Product Description

The IRWIN 88708 is a spade blade drill bit designed for boring clean holes through wood framing, sheathing, and rough lumber in trade and construction applications. Built from high-speed steel with a bright finish, this bit measures 1/2 inch in diameter and 16 inches in overall length, making it well suited for deep boring in wall cavities and floor assemblies. The 1/4-inch hex shank provides a secure, slip-resistant connection in compatible chuck systems. Electricians and plumbers routinely reach for this style of bit when running wire or pipe through structural members.

The 88708 fits residential and light commercial rough-in work where extended reach is required. Its 16-inch overall length allows drilling through thick assemblies without requiring a bit extension. The 1/4-inch hex shank seats in quick-change chuck systems and standard keyless chucks. This bit is a practical choice for electricians fishing wire, plumbers routing pipe paths, and HVAC techs drilling for low-voltage or refrigerant line penetrations through wood members.

Key Features

• 1/2 inch cutting diameter for standard rough-in hole sizing
• 16 inch overall length for deep boring in wall and floor assemblies
• High-speed steel construction for durability through wood materials
• 1/4 inch hex shank for secure fit in quick-change and standard chuck systems
• Two-spur tip geometry for cleaner entry and reduced tear-out
• Bright finish with no coating buildup that could affect dimensional accuracy

Compatibility

Designed as a standard spade blade drill bit compatible with drills and right-angle drill attachments accepting a 1/4 inch hex shank.

Installation Notes

Installation of this bit is performed by electricians, plumbers, and HVAC technicians during rough-in phases. Ensure the drill is powered off and the chuck is fully seated before beginning. Follow local building codes regarding hole sizing and placement relative to structural members, including requirements under the NEC and IPC for clearance and protection of penetrations. Wear appropriate eye protection when boring through wood framing.