Hardened steel shackle coated in soft plastic. Weather protected combination lock with 10000 possible combinations. Foam backed body to avoid scratches on your car. Includes proximity key blocker. The FCS KeyLock is a weather protected combination lock that attaches to a number of points on your car. With up to 10000 combinations, it secures your keys or anything else you can fit inside so you can surf, swim or run freely.