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Sliding Door Hook Lock With Key Surface-mount locks work well for locking sliding glass doors, closets, lockers, and bi-folding doors. They are safe from lockpicking and bumping, and allow you to control access with pin code or fingerprint scans that are biometric. Track locks are attached to the rail of a sliding door or window and block movement, however they're not as secure as other locks. Lockey C150 Mechanical Digital Sliding Door Lock The Lockey C150 mechanical digital keyless