The DEFCON® MKL Cable Lock is a 25-pack of master-keyed locks featuring a push-button for quick locking and a 6 foot steel cable with a loop on one end and a lock on the other. Any tampering will noticeably damage the computer, preventing resale and discouraging theft. These locks utilize the standard security slot already built into your laptop and ship with 25 locks and 25 pairs (2 PCS) of individual lock keys.