Master Lock padlocks fill a wide range of security needs for offices, businesses and industrial plants.

• pin-tumbler locking mechanisms -- they are highly resistant to pounding, twisting and prying.
  
• padlocks with "hardened" shackles (loops) to resist cutting. (Check the product's packaging to find this information.) For outdoor applications, some padlocks have special weather-resistant plastic covers to stand up to the elements.