Hitachi 115450 #2 Square 6" Driver Bit - Metabo HPT

The Hitachi 115450 — now sold under the Metabo HPT brand following a corporate rename — is a #2 square drive bit machined to 155mm (6 inches) in alloy steel, designed for driving square-head fasteners in wood construction and finish work. The extended length is the defining specification: where a 1-inch or 2-inch bit forces a drill perpendicular to open material, the 6-inch shank provides the clearance needed to reach fasteners in cabinet interiors, deep pocket holes, framing bays, and multi-layer deck assemblies. The #2 square drive profile is well-matched to the 6, 8, and 10 gauge fastener range standard across North American framing and decking, and the anti-cam-out geometry of the square recess keeps the bit seated under the high torque loads those applications generate.

This bit is a fit for trim carpenters, deck builders, and framing crews who regularly encounter installation conditions that defeat standard-length bits. It ships as a single genuine Metabo HPT accessory with a 1/4-inch hex shank, meaning it drops into any cordless drill or driver without an adapter — no ecosystem lock-in. The 30-day warranty is short relative to the expected job-site lifespan of a well-maintained driver bit, so it reads more as a quality defect guarantee than a long-term durability promise. For high-volume impact driver use, verify impact-rated status before committing it to sustained torque cycles; for standard drill/driver applications on construction fasteners, it is a reliable, purpose-built reach extension.