BENEFIT -- Heavy duty wrench features a 3/4”(1266) / 1/2"(7463) square drive to tackle even the most stubbom gland nuts. WORKS ON -- Alternative to OTC 1266 & 7463. For use on hydraulic cylinders with nuts from 2" to 6" (51mm to 152mm) and 1" to 3-3/4" (25 - 95mm).