The Leather Anklecuffs have adjustable metal buckle fastenings which can be adapted to fit ankles with up to a 11.5 inch circumference. Each restraint has a D-ring with attaches to the metal spreader bar via carabine hooks. The spreader bar is made up three sections allowing it to be adjustable from 21 to 33.5 inches in width. Simply select the appropriate width and insert the pins into the holes on the spreader bar.