One should never leave a bike unlocked when unattended. Kryptonite U-locks are a quality product, offering more security than any cable-type lock. There are many U-locks to choose from, with ratings of moderate, high or ultimate security. Kryptonite stands behind its products by providing an Anti-Theft Protection Offer on specific locks and a lifetime warranty. It is a program that reimburses registered customers for a specific monetary amount in the event their bicycle/motorcycle is stolen due to the opening or breaking of the lock by force. To register go to https://shop.kryptonitelock.com/atpo_order_forms/atpo-registration.html
The KryptoLok Combo U-lock features a high security pick and drill resistant disc-style cylinder.