This 5'6" long high security chain is hard core and meant for locking up serious valuables. The chain links are 10 mm (3/8") thick, heat treated and hardened. Its square shape offers superior resistance to cutting compared to round links. This chain comes complete in a black protective sleeve. The black sleeve offers protection around the chain and noise suppression. You may not be able to handle a chain of this security prowess. You should probably leave now.