This is another variation of an arris rail support bracket. These brackets allow a triangular arris rail to be attached to a post without the need for a mortise hole in the post or the rail being ended to slot into that hole.
The benefits are that they are quick and easy to fit. You can move the rails up and down the post to position them where you need them.
With these particular brackets you rest the arris rails down into the bracket and can attach them with just a single screw this could allow for a relatively quick removal. So you could if needed use these for a removable fence section.~
Please note these brackets are handed left or right hand.
Width 65mm (2 1/2″)
Depth 65mm (2 1/2″)
Length 92mm (3 1/2″)