Features and Functions: Non-lockable chain operated window winder. Suitable for timber or aluminium awning windows. Smooth operation. Foldable handle knob. Through fly screen operation. Hooded sash bracket prevents chain being disengaged from sash. Maximum opening 300mm (19 turns to fully open). Maximum weight of sash 15kg. Body length 280mm. Restricted opening models are also available. Zinc diecast body and mechanism. Zinc plated steel base plate. Supplied bulk packed.