Designed to resist some of the most sophisticated theft methods, the S2 955 Chain Lock is the perfect way to keep your pride & joy safe. With its heat treated Boron Manganese Steel chain with massive 7mm four sided links & a hardened deadbolt, the Kryptonite S2 955 Integrated Chain Lock is highly resistant to pulling, prying & bolt cutters while the included nylon webbing cover protects your bikes paint from damage & also protects the lock from sawing attacks by jamming the blade. The Kryptonite S2 955 55cm Integrated Chain Locks disc style lock cylinder is designed to resist drilling & picking & is supplied with two special I keys that improve the smoothness of the lock while being comfortable in your h&. The Kryptonite S2 955 55cm Integrated Chain Lock is rated to a Sold Secure Bicycle level of Silver making it resistant to common attacks while being able to withstand power tools for a limited time.