The stainless steel attachment mechanism makes this one of the strongest laptop cable locks on the market. This lock uses our Master-Access key option to give each user access to their own lock and the administrator access to all locks using the Master Key (CSP800814) sold separately. Each lock comes with two keys. IF USERS DO NOT NEED ACCESS, PURCHASE SUPERVISOR-ONLY ACCESS LOCKS (CSP820648) AND KEYS (CSP800896) INSTEAD.