In brief ...... 

The catches simply allow the gate to be opened in both directions and safely locked shut when closed
They can be fitted anywhere on the gatepost to a height that suits you
farm one way_edited_edited.jpg
They can also be added to existing one way opening gates ensuring easy opening and the security of locking shut, no more gates bouncing back open
GC catch locked.jpg
The catches can be locked
with a padlock.