The Makita 18V LXT Lithium-Ion Cordless 1/2" Impact Wrench (No. BTW450) delivers high-torque impact power with a 1/2" square drive that will fit impact-rated socket sets. The versatile BTW450 packs plenty of torque at 325 ft./lbs. for a wide range of fastening and loosening tasks, and is a powerful and convenient substitute for air powered and AC wrenches.