3/8 In. Drive X 5/16 In. Deep 12-Point Socket •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