Security - Kryptonite Keeper 712 Chain Lock with Combination or Key: 3.93'Kryptonite Keeper series chain locks offer moderate security appropriate for quick stops in metropolitan areas or a few hours out in less populated areas. Fabric covered chains protect your bicycle's paint from scratches and abrasions. Integrated end link locking point eliminates the need for a separate lock when using the chain. Combo: 120cm chain length End link design secures chain to a hardened deadbolt offering no weak links in the chain. 4 digit