OTC Tools OTC 7309 Heavy Duty Adjustable Hook Spanner Wrench, 4-3/4" to 12-3/4" Capacity. Some jobs require beefier tools. Heres a wrench to fill that need. Its drop-forged and features extra heavy construction and a 3/4" thick, 11-position hook jaw thats capable of gripping fasteners from 4-3/4" to 12-3/4" O.D. Handle is 25-3/4" long and 15/16" in diameter. Fed Spec GGG-W-665b.