FJM Security SX-790 4-Dial Combination Disc Padlock With Shielded Hardened Steel Shackle and 10,000 Possible Combinations Combination discus lock is the perfect keyless solution for those needing robust padlock protection  hidden shackle eliminates vulnerable points on the lock The FJM Security combo lock has an exterior constructed out of rust resistant stainless steel  perfect for outdoor applications in need of reliable protection This combination lock features a rounded discus shape with a shielded hardened steel shackle designed to resist attacks from slashing, sawing and bolt cutters Factory default combo for the disc lock is 0-0-0-0 and can be easily reset to the combination of your choice with just a paperclip FJM Security discus padlock is perfect as a shipping container lock, storage unit lock, gate padlocks, bike padlock, storage locker lock and more