Including solid steel body hardened for optimal strength and security, Universal Puck lets user change security of lock by changing lock cylinder. It is designed to use standard vending lock cylinders, such as Abloy, Medeco, or Cobra 7. Also available, 8100 and 8200 Series are optimized for security and leverage industry-standard lock cylinder. Both are constructed out of solid steel and come with hardened steel shackles, which can be changed by end-user to 1 or 2 in. shackles.