●Chain Size: 4mm ●Reference Weight: 18.2 oz (520 g) ●Hardened steel chain with a length of 140cm ●You can lock the front and rear wheels, saddles and frames into fixtures with this single unit ●The chain lock is difficult to cut with small wire cutters for high security ●No need to worry about losing your keys. The dial number can be changed freely ●2-way design that can be used with both double and single loops ●Compact design that folds down to fit in pants or jersey pockets