This heavy duty wrench was designed to work with YHM's 1.375"-24 HUB mounting systems. On one side you'll find a 3/4" open ended wrench made to loosen/tighten our Q.D. Mounts and our Direct Thread mounts. On the other, a spanner made to fit around our HUB adapters as well as a 1/2" Torque wrench slot to help tighten things to a specific torque spec. Heat treated Melonite QPQ finish HUB Spanner Wrench 3/4" Open Ended Wrench 1/2" Torque Wrench Length: 7.75" Weight: 5.792 Oz. Works perfectly with YHM's Phantom Q.D. mounting system