OTC (1908) Locknut Socket - 6 point, 3-1/4 Opening Size Style: 6-Point Size: 3-1/4 Inch, Model: 1908, Tools & Outdoor Store Opening size is 6 point and 3-1/4 inches Specially designed and makes wheel bearing locknuts easy to remove or install 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