This innovative quality window fastener from Interlock is for use with aluminium or uPVC windows. Patented internationally, this unique window fastener has the 'wedge' incorporated as a folding flap attached to the base of the handle Suitability - Suitable for use on residential awning and casement windows. Available in left and right handed models. Fixing Surface - Aluminium, uPVC Finishes - Satin Chrome, Powdercoat, Special Colours