Hank's Surplus Heavy Duty Replacement Bungee Snap Cord Locks (Pack of 6) (Black) Made from very strong Acetal polymer plastic Designed to fit three cord sizes: One 1/4" (6mm), two 3/16" (5mm), two 1/8" (3mm.) Squeeze the bottom sides to pop open lock and can be reset to open by pushing down top spring until you hear a click A great replacement cord lock for bags, pouches, backpacks, luggage and other outdoor gear.