The Kryptonite Kryptolok 955 Integrated Chain Lock is rates as Sold Secure Silver. The 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 Kryptolok chain is enclosed in a nylon-webbing sleeve to protect paint from scratches & allow for compact coiling while transporting. Kryptonite recommend this lock for use in low to moderate crime areas. Features 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 & unlocking; also prevents the nylon cover from sliding approved to silver sold secure standard