DetailsSeries 4:~ 1.8" x 2.1" (48mm x 54mm). 14mm hardened MAX-Performance steel shackle resists cutting and leverage attacks. Double deadbolt locking mechanism has extensive holding power. Reinforced anti-drill/pull cylinder protection system. Sliding dust cover protects and extends cylinder life. Includes carrying pouch and disc lock reminder. 3 keys - one lighted with high intensity bulb & replaceable battery.