Shock Cord Hook is a white, plastic hook for use at the end of shock cords. This hook is safe for use on finished or plated surfaces. Shock cord is inserted at the end of the hook and tied off to secure. A 3/16" shock cord with an overhand knot pulled very tight will fit in the center of this hook's opening. A 1/4" shock cord with overhand knot will not fit the center of this hook's opening (it will rest to the side of the opening). A hog ring will also not fit the center opening of this hook.