The neck restraint in this bondage set is adjustable up to a 17 inch circumference. The wrist cuffs are 3.5 inches wide and are adjustable up to 10.5 inch wrists and have double fastenings. Link the wrist restraints via the carabine hooks and then attach the leading cuff to the back strap. The back strap has completely adjustable metal buckle fastenings so that the sub's arms can be restrained as far up or down their back as required.