Master Lock 411KALTRED Keyed-Alike Safety Lock Padlock, Extra Length Shackle Zenex thermoplastic body is nonconductive and functions in temperatures from -70 to 350 degrees F Retains key until locked, to ensure padlock is not left unlocked Keyed alike 6-pin tumbler cylinder for security with single key convenience for multiple locks 3"/76 mm vertical shackle clearance for extra length Limited lifetime warranty