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Sliding Door Hook Lock With Key Surface-mount locks can be used to secure sliding glass doors, cabinets, closets, lockers and bi-fold doors. They are impervious to bumping and lockpicking and can be controlled by pin code or biometric finger scan. Track locks are fixed to the rails of sliding doors or windows, and prevent movement. However, they are not as secure as some other alternatives. Lockey C150 Mechanical Digital Sliding Door Lock The Lockey C150 m