Kryptonite's Evolution Series 4 1090 Integrated Chain is a 10mm-thick, six-sided link chain made of triple-heat-treated manganese steel for maximum strength. At 35.5-inches long, the Evolution gives you biking security in an easy-to-carry package. The links are covered with a weather-resistant nylon sleeve that protects your bike's finish, and it uses an integrated high-security cylinder that is pick, drill, and cut resistant. Three keys are included, including one that has a high-intensity LED bulb for convenient, easy unlocking in the dark. This chain has an anti-theft protection offer.

The Ionus Chain 8900 offers great mid-level security by itself or as an ideal second lock for urban riders requiring an additional security option to supplement their heavier u-locks. Easy to use, easy to transport. - 8mm square hardened steel chain links - Pinned fabric sleeve protects bike's frame and paint job - Chain, lock body and supporting elements all made of special temper hardened steel - Two keys supplied with lock - Anti-drill protection plate at keyhole - Industry leading corrosion resistance makes this lock incredibly durable.

ABUS leaves nothing to chance. We have equipped this chain lock with high-quality two-component number reels. That way, you will get years of enjoyment out of your lock. The numbers on this combination lock remain legible even after prolonged use. We want you to enjoy your bicycle and your ABUS lock for as long as possible. That is why we don't apply color to the numbers and produce the number reel from two durable components. - 5mm thick square chain with textile sleeve that prevents damage to paintwork - The chain is made of special steel - Two-component number reels guarantee long-term readability of the digits - The number code can be set individually

Big cities call for big protection, and Kryptonite's New York Chain delivers with 12mm six-sided chain links made from hardened manganese steel. Wrap this burly lock around your frame worry-free thanks to the durable nylon cover that protects your bike's paint from scratches. Leave with peace of mind knowing the 14mm hardened Max-Performance steel shackle mated to the Evolution Series 4 Disc Lock is on duty. With a double deadbolt design to protect against twist attacks, would-be thieves with an eye on your bike don't stand a chance. It includes three stainless steel keys--one of which is lighted for night access!

Serfas' Combo Cable Lock offers convenient protection. The 12mm-diameter cable reaches over 6-feet and self coils for easy storage. A 4-digit customizable combination lock, surrounded by molded rubber, ensures your bike stays put. And, a vinyl coating protects your bike's finish so it looks just as good when you return to ride it.

Strength and simplicity come together in OnGuard's Akita Combo lock. It's a 6-foot by 1/2-inch thick cable lock that provides sturdy, reliable protection without any keys. All you need is a four-digit number you can remember, which can be reset at any time. The Akita Combo is built tough and easy to use.

With OnGuard's Doberman Combo lock, all you need is your bike, the lock, and a number you can remember. This combination lock uses four numbers and can be reset any time. It's made from a strong steel cable covered with tough vinyl to protect both itself and your bike. The Doberman Combo is also self-coiling for easy transport.