Kryptonite Keeper 712 Chain Lock Not only are bikes expensive, but chances are you love your bike and have even named it. Don't let anybody steal your precious baby away from you and ensure your bikes safety when you aren't looking with the new Kryptonite Keeper Lock. Made from 7mm-thick hardened 3T manganese steel, the Keeper Lock is a heavy-duty chain lock that is finished off with a protective nylon sleeve. A hardened deadbolt design makes for a super tough construction and the deadbolt has an anti-rotation feature to resist twisting. The Keeper Chain Lock is available with a keyed locking system or a four-digit combination lock pod. The Kryptonite Keeper 712 Chain Lock has a 47. 3-inch length and weighs in at 3. 75 to 4. 5 pounds. Features 7mm, four-sided chain links made from 3t manganese steel Hardened deadbolt design with anti-rotation resist against twist High security disc-style cylinder is pick and drill resistant Two ergonomic "I" keys Weather-resistant nylon sleeve prevents scratches47. 3" chain length Weight: 3. 75- 4. 5 lbs Lifetime warranty | Kryptonite | Keeper 712 Chain Lock Key: 3. 93' (120Cm) | Nylon