High security 4 pin tumbler padlocks for good pick resitance. Hardened steel shackles resist cutting and sawing. Dual locking mechanisms guard against pulling, shimming and rapping. Heavy duty laminated steel cases resist tampering and stand up to severe physical attack. Plated to resist rust and corrosion. All padlocks include 2 brass keys. If we do not stock a specific key number for your existing Master Locks, Colony can special order it for you.