Vermont American 15526 7-Piece Power Nutdriver Set Ideal for fast, easy driving of nuts, bolts and hex head screws. Rugged single-piece construction provides long life under constant use. The precision formed tip ensures a proper fit Universal 1/4" hex shank with power groove Universal, 1/4" hex shank fits all drills Lifetime Replacement Policy A Vermont American product will provide complete satisfaction for the life of the product or it will be replaced free of charge