Seven sizes of High Impact Deep Sockets that allow the bolt to travel over 7 inches, deepest on the market, for tightening and breaking of nuts. The unique one piece design is cast from High Strength S-5 Striking Steel and then during heat treating drawn back to the highest strength possible for the most enduring tool. Completely balanced so there is no wobble, making it easier on the impact tool. Designed to take the abuse from heavy impact work with either air or electric tools.