This Beyonet UPVC Window Lock Gearbox from Saracen uses bayonet style rods for the locking which attach into either side of the Saracen Bayonet UPVC window lock gear box. These models come in two different sizes, both a 20mm & 22mm versions; the 22mm has a unique lip on the edge of the plate. The bolt projections for this gearbox is a standard 11..