The KryptoLok Series 2 Integrated Chains include 9mm four-sided chain links made from triple heat-treated boron manganese steel. The chain secures with a new patent-pending Integrated KryptoLok series 2 Lock head with talon deadbolt. The innovative chains also include a new patent-pending pin-less link design which allows for no weak link in the chain. Chains are enclosed in a nylon-webbing sleeve to protect paint from scratches and allow for compact coiling while transporting. Recommended for use in low to moderate crime areas. Comes with 2 ergonomic 'I' keys. The new 'I' key makes opening a disc-style cylinder much smoother. Uniquely designed end-link moulded covers, which allow ease of holding the end-link while locking and unlocking; also prevents the nylon cover from sliding. Approved to Silver Sold Secure standard.