Wera 05066702001 871/6 5/16'' Hex Torq-Set Mplus Power Drive Bit are the stronger flanks - when compared with the conventional TORQ-SET profile - result in 70% more breaking torque and thereby enhanced durability whilst at the same time providing a perfect fit in the screw head. Wera 871/6 5/16'' Hex Torq-Set Mplus Power Drive Bits are suitable for holders as per DIN ISO 1173-F 8.