OTC Tools OTC 7308 Adjustable Hook Spanner Wrench with 2 Jaws, 4-3/4" to 12-3/4" Capacity. This piece will replace many fixed-size wrenches needed to service industrial tractors and other equipment. Their drop-forged jaws adjust to 11 positions for a capacity of 4-3/4" to 12-3/4" O.D. Handle is 24" long and 1" in diameter. Includes two jaws. one 3/8" thick jaw, one 3/4" thick jaw. Federal Spec GGG-W-665b.