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Sliding Door Hook Lock With Key Surface-mount locks can be used to secure sliding glass doors, cabinets, closets, bi-fold doors and lockers. They are immune to bumping or lockpicking, and can be controlled via pin code or biometric finger scan. Track locks are attached to the rails of the sliding door or window and block movement, however they're not as secure as other options. Lockey C150 Mechanical Digital Sliding Door Lock The Lockey C150 mechanical digital keyless lock provides security without the use of batteries or elec