From The Anvil Black Medium Bean Thumblatch XL 33815
Handle length 216mm
Thumb bar length 165mm
latch length 190mm
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 pin are provided (discard the one you don’t want to us).
This latch comes with an extra long thumb bar for use on doors with a maximum thickness of 75mm