Irwin 18373 Series Square Recess Impact Insert Bits, 2-Piece Set, 1/4" Hex Shank

Irwin 18373 Series Square Recess Impact Insert Bits, 2-Piece Set, 1/4" Hex Shank

The Irwin 18373 Series Square Recess Impact Insert Bit Set pairs two 1/4" hex shank square recess insert bits engineered specifically for use with impact drivers rather than standard drills. This family is available across two matched models within the set, each manufactured from cold-forged, high-grade steel to withstand the extremely high torque output generated by impact tools, with a black oxide finish that resists corrosion and extends usable life. Precision tip geometry ensures a tight, accurate fit inside square recess fasteners, reducing slippage, stripping, and cam-out during repetitive driving tasks on the jobsite or in the shop. This set is part of Irwin's broader Impact Performance Series lineup, engineered for impact drivers rather than general-purpose drilling.

Key Features

• Shank Diameter: 1/4" hex shank fits standard impact driver and drill/driver chucks for quick, secure bit changes.
• Durable Construction: Cold-forged, high-grade steel construction withstands the extremely high torque output produced by impact drivers.
• Square Recess Drive: Precision tip geometry delivers superior fitment inside square recess fasteners, reducing stripping and cam-out compared to standard bits.
• Impact Performance Series Design: Engineered as part of Irwin's Impact Performance Series specifically for maximum durability and long life with impact drivers, not just compatibility.
• Extended Bit Life: Forged construction, rather than the milled construction used on traditional bits, allows fasteners to fit more precisely and gives these bits up to three times longer life.
• Corrosion-Resistant Finish: Black oxide finish resists corrosion and further increases the working life of each bit.
• Application-Specific Engineering: Designed for repetitive impact driving rather than general-purpose drilling, helping maintain fastener engagement over time.
• Set Configuration: Sold as a convenient 2-piece set of matching square recess impact insert bits, with two models available within this family.

Technical Specifications

• Shank Diameter: 1/4"
• Bit Type: Square Recess Impact Insert Bit
• Pack Quantity: 2-Piece
• Material: Cold-Forged, High-Grade Steel
• Finish: Black Oxide
• Description: Square Recess Impact Insert Bit (2-pc)

Typical Applications

• Driving Square Recess Fasteners with Impact Drivers
• Cabinetry, Furniture, and Woodworking Assembly
• Deck, Framing, and General Construction
• Professional Trade and Jobsite Fastening Tasks
• Everyday DIY and Home Improvement Projects

Why Irwin?

Irwin engineers its Impact Performance Series bits specifically for the demanding torque loads of impact drivers rather than simply adapting standard screwdriving bits. The cold-forged, high-grade steel construction paired with a black oxide finish reflects a manufacturing approach focused on precise fastener fitment, corrosion resistance, and long-term durability that tradespeople can rely on for repetitive daily use. This 2-piece square recess set gives professionals and DIYers a matched pair of bits engineered for reliable, long-lasting performance on the jobsite or in the shop, backed by Irwin's reputation for durable, application-specific tooling.