The OTC 1928 is specially designed and makes wheel bearing locknuts easy to remove or install. Itâs made of high-strength steel and resists rounding out. Opening size is 6 point and 2-9/16â. Fits special "rounded" hex nut found on Dana axles of some Ford trucks. Depth of socket is 5". NOTE: Socket is designed for use with 3/4â square-drive manual tools only. Impact tool use voids socket warranty.