Impact Ready magnetic nutdriver bits are ideal for impact drivers and wrenches. Impact Ready bits can withstand up to 2000 in./lb. of torque. Patented geometry reduces rounding of the hex. Advanced hardening process provides maximum durability. Extra-strength magnet delivers superior bit retention. Nutdrivers have recessed corners for drives on flats that minimize shavings. 1/4" shank. Set includes 1 each 1/4", 5/16", 3/8", 7/16", and 1/2". Carded.