The From the Anvil Night-Vent Locking LH Monkeytail Fastener Beeswax is screw fixing and when used, there is no need for trickle vents. The keep plate will screw to a mullion with a 20mm flat, leaving more room for mouldings. It is a left hand fastener and can be locked in the night-vent and closed positions with an allen key - the nylon washer behind the handle is designed to reduce friction. The handle length is 136mm x 44mm, the fixing plate size is 60mm x 16mm and the keep plate size is 57mm x 16mm. Sold individually, the fastener comes complete with fixings. Beeswax Fastener The fastene...