We have uploaded instructional videos to the individual product listings for The Grip Restraints. The Grip uses a seat belt type material that locks with stainless steel buckles. The locks open with a handcuff key and do not need to be double locked. We have Grip Restraint items available in standard nylon, kevlar, and MRI-safe versions with locking buckles made of non-magnetic brass.
Available at Handcuff Warehouse: The Grip Restraint System