This best seller, protects All mac locks, macbooks, macbook pros, iMacs and other notebooks against theft . This best seller, protects All mac locks, macbooks, macbook pros, iMacs and other notebooks against theft. Maclocks Universal Security Cable lock has a loop-ended cable made of galvanized steel and is slimmer than most cable locks. The locking head is designed to fit with standard security slot for PCs, laptops, and our Maclocks Enclosures.