SAE Size Labels: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1". 3/8 Drive Lock-a-Socket. We focus on making purchasing online a pleasant experience. Our sales office is located in beautiful town of Redondo Beach, California, just a few miles South of Los Angeles International Airport.