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