The Astro pneumatic tool 78340 SAE 8-piece 3/8-inch drive Nano pinless Universal impact sockets are up to 11% shorter than standard low-profile Universal impact sockets and are made from cro-mo with lifetime warranty. The pinless design in these sockets allow for a full 360°of freedom for the Universal head to angle and rotate. As a result, the new hex ball swivel design takes more abuse than the "winged" Designs by transferring more of the impact force to the bolt itself.