Synergy Series™ I/O-Equipped Mini Grip Clamp is Capable of exerting very strong clamping force, IO-GCM has jaws that open up to 1.18″ to hold gear weighing up to 66 lb. The jaws themselves were designed with peaks and valleys to accommodate as many odd shapes as possible whether they’re round, square diamond or irregularly shaped. The clamp has one 1/4″-20 female threaded hole to allow for mounting of additional equipment.