Combination Coil bicycle locks are perhaps the most convenient/secure ratio lock in the market. The Entity CL30 Combination Coil Lock utilizes a 0.5inch diameter, 6 foot cable that provides you enormous flexibility to lock your bike on anything attached to the ground, it being a tree, bike rack, benches or street lamps. If you ride with friends or have kids, you can also use the Entity CL30 to lock multiple bikes together. The 4 digit code offers 10.000 possible combinations and is made out of Zinc Alloy, covered with ABS. Combination coil lock. 0.5inch diameter matt black PVC coil for added security 6 foot coil length for convenience when locking to trees, and multiple bikes. Frame bracket to securely store the lock whilst not in use. Lock body is Zinc alloy covered with ABS