DRIVEN DESIGN: with a torsion zone built to last, hardened surface and precision tip. PRECISION-MILLED BIT TIPS: deliver a better fit and less cam-out. TORSION ZONE: built to last, with a new tapered design, it absorbs the torque peaks of impact drivers to avoid breakage. HEAT-TREATED BIT MANUFACTURING: provides more durable bits. IMPACT-RATED INTERFACE: made to fit 1/4 In. hex impact drivers.