Lockwood Sliding Door Locks and Hardware The Lockwood range of Sliding Door Locks incorporate advanced security and safety features. The ideal choice for sliding patio and cavity door applications. Lockwood Onyx Patio Sliding Door LockLockAlert feature indicates the lock status at a glance. Lockwood 8653 Sliding Security Screen Door LockLockAlert feature indicates the lock status at a glance. Lockwood Cavity Sliding Door LocksAvailable in Entrance, Privacy, Passage and Passage Latch models. Lockwood Symmetry® Sliding Door SetCompact door set for timber cavity sliding doors. Lockwood 680 Patio Bolt Lockwood Durabolt®Surface mounted bolt.