Wera 05066744001 871/7 7/16'' 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 871/7 7/16'' Hex Torq-Set Mplus Power Drive Bit are suitable for power screwdrivers with a take-up as per DIN ISO 1173-F 11.2.