OTC (1929) Locknut Socket - 8 point, 2-5/8" Opening Size Opening size is 8 point and 2-5/8 inches For Chevrolet and GMC 5200 and 7200 pound axles Made of high-strength steel Resists rounding out Socket is designed for use with 3/4 inch square-drive manual tools only; Impact tool use voids socket warranty