Tower Security Limited, Locksmiths & Security Engineers
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Everything to secure you home and office
Surface fitted door locks and latches
Privacy latch
Blocking lock
Deadlock 1116
Deadlock 1165
Deadlock 1139
Deadlock FB
Deadlock RLB
Sahlock 1445 & 1448
Sashlock 2098
Sashlock 1465
Sashlock 1439

Quality Locksmith in London

Approved Safe Contractor
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Home Security
Providing Peace of Mind

Rim Locks & Latches
Surface fitted locks (or rim locks) offer very little resistance to either picking or forced attack.
The cases are generally manufactured from light grade pressed steel and are only as strong as the screws which hold them to the door.
Most are supplied with a pressed steel striking box which, again, is only surface fitted.
The best quality surface locks offer a key range of only 50 differs, which means that there are only 50 different keys before they start repeating.
When replacing old rim locks the most important measurements are the 'backsets' - this is the distance between the edge of the door and the holes through the face of the door - if these cannot be matched exactly new holes will have to be made through the door which can look unsightly.
Surface locks are normally fitted on the inside of the door because if the are fitted on the outside they can simply be removed by undoing the fixing screws. They cannot normally be used on outward opening doors unless specifically designed (or adapted) to do so.