The Kryp chain/lock combo is secure, but when locking up w/ chain, nothing beats the speed and convenience of an ABUS style monobloc lock. Reason? The ABUS design is non-key retaining (does not require a key to lock-up) and ABUS is a one piece lock. As opposed to the Kryp 2-piece. The ABUS sliding shackle is also very smooth. Can be purchased from your local locksmith or hardware store (if they stock high-quality stuff). We ship about 50 1-meter locksets a week at $35/each, shipping included, Bike Security Chain/Monoblock lock.