POLYPLASTIC 1 Pair x 300mm Polyplastic Auto Stay with Lever Lock, set of 2 window stays with a screw-on fitting to the windows. These aluminium ratchet operated window stays are specifically designed to fit Polyplastic opening windows fitted to many caravans and motorhomes. No extra fittings.
 
NB Please note some companies advertise these as 280mm Some as 300mm - they are the same.