2. Open With a key - You can open the lock from both sides with a key. 3. Lock Fitted in Door Material - The lock is fitted into the leading edge of the door NOT the surface of the door. 4. 5 Levers - The number of levers SHOULD be stamped on the faceplate of lock e.g "5 LEVER".. Deadbolts. "Deadbolts are the stalwarts of home security," says Klimaszewski. "They come in single and double-cylinder varieties. Single-cylinder deadbolts are great for exterior doors, while double-cylinder deadbolts, requiring a key on both sides, are ideal for doors near windows.".
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Lock grade is the number of lock/unlock cycles you can expect your lock to complete before wearing out. It's a reflection of the durability of the internal door lock types, not the amount of security they provide. Locks that are Grade 1 offer the highest level of strength. Grade 1: 800,000 cycles. Grade 2: 400,000 cycles. Grade 3: 200,000 cycles.. Deadbolt locks come in three primary types: single, double and vertical. Single-cylinder deadbolts are the simplest and can be activated from one side via a key. Double-cylinder deadbolts can be used with a key from both sides. Vertical deadbolts operate similar to single and double deadbolts, but the lock moves up and down instead of horizontally.
