3/8 Inch Drive x 1/4 Inch Deep 12-Point Socket About this item 12-point opening fits double hex (12-sided), hex, and square-shaped fasteners Socket geometry is designed to apply force to flat sides of fasteners and not the corners, preventing round-off Deep-length sockets reach into wells and accommodate the excess threads of longer shafts Extra-large die-stamped size markings are easy to read and can?t wear off Polished , chrome-plated finish easily wipes clean and is highly resistant to corrosion Four detent grooves provide a secure connection with the drive tool Beveled inner rim of the socket opening helps guide it smoothly onto fasteners