1/4 Inch Robertson Square Drive Screwdriver Bits 25 mm ROB3

This 3-pack of Teng Tools ROB3 Robertson square drive bits gives heavy-construction pros a ready supply of the larger size needed for structural fasteners. Each bit features a 1/4 inch hex shank that seats in standard quick-change chucks and bit holders, so switching between a drill and an impact driver takes only a moment.

At 25 mm (1.0 in) overall, the compact profile keeps the tip close to the chuck for controlled, forceful driving. That short reach is valuable when sinking large-diameter fasteners into dense lumber, engineered beams or ledger boards where precise alignment prevents cam-out and protects both the screw head and the surrounding material.

Robertson fasteners in larger sizes handle the structural loads found in deck framing, post-and-beam construction and commercial installations. Stocking individual 3-packs lets you skip mixed sets packed with smaller sizes you already carry. Toss a spare in your tool belt, keep one in the gang box and mount one in your driver so a worn tip never stalls progress.

Whether you are bolting ledger boards or driving structural screws into laminated beams, these ROB3 bits deliver the square-recess engagement and quick-change convenience that keep heavy-duty projects on schedule.