Offering the security of a hardened chain along with a convenient integrated lock, the Kryptonite Keeper 785 Integrated Chain Lock delivers reliable protection when securing your bike. 7mm 4sided chain to provide flexible security for your bicycle; weatherresistant nylon cover won't scratch your frame Highsecurity, discstyle cylinder is pick and drill resistant Hardened steel lock body covering the cylinder; includes hardened deadbolt Eligible for Key Safe Program: register your key number with Kryptonite for easy replacement of lost or worn keys for a minimal fee Kryptonite rates this lock a 5 on their 10point system with 1 being simple, deterrent security and 10 being extreme security 2 keys included Length: 33.5 inches  Weight: 3.5 lbs