Our 3/8 in. drive SAE 6-Point Socket with FOUR FLAT Sides was designed from the ground up to be part of the most versatile socket family. Milwaukee sockets feature an innovative design with four parallel flat sides. The socket sizes are stamped into the flats providing you with improved, easy-to-read visibility. We back all our sockets with a lifetime guarantee.Find the DEEP SOCKET SAE 3/8X1 at Ace.