From The Anvil pewter bean thumb latch.
The thumb piece passes through the door and raises the latch bar off the keep. To restrict the latch bar movement a staple pin and a screw-on staple pin are provided (discard unused pin or find another use around the home).
Latch length: 190mm. Thumb bar size allows for use on doors with a maximum thickness of 55mm or 75mm.
Sold as a set and supplied with necessary fixing screws.