Our most popular alternative to a U-lock, Kryptonite's heavy duty Keeper chain with integrated key lock is constructed with 7mm four-sided chain links made from manganese steel.
We have sold more than 500 of these without a single bike theft being reported back to us.
A durable weather-resistant nylon sleeve covers the chain links to prevents scratches to your bike frame.
And the 33 inch length is long enough to go around the frame and front wheel at a bike rack or to secure two bikes side by side around a rack.
Stronger and tougher to cut through than most of the U-locks on the market.
Includes two keys.