The From the Anvil Night-Vent Locking Peardrop LH Fastener Black is screw fitted and there is no need for trickle vents. The keep plate will fit to a mullion with a 20mm flat and this will leave more room for mouldings. It can be locked in the closed and night-vent positions with an allen key. The handle length is 136mm x 44mm, the fixing plate is 60mm x 16mm and the keep plate is 57mm x 16mm. It is sold individually complete with fixing screws. Black Fastener The fastener has a black finish - this is baked in a high-temperature oven to give it good durability and can be used internally or e...