Used on a pair of gates or doors, the 450mm/18” lockable dropbolt fits to the inactive gate or door within a pair (first gate or door to close) and gives something for the more often used gate or door to close against but with the advantage that you can add a padlock (not supplied) to the dropbolt to keep it locked shut!
Ideal if you’re often away from home and leave a vehicle, caravan or trailer parked on your drive, as allows pedestrian access but can put off anyone making off with your vehicle!
Also ideal (as I’ve found out) if you have little people (Children!) who constantly fiddle with a standard dropbolt and leave it in the open position meaning your gates swing open when you’re not expecting it, add a padlock and lock the gate down! Lets see them pick a lock to cause their mischief now, unless they come armed with a pair of bolt croppers eek!