32x15 inch White Precision Slider Basement Window. Constructed of rigid PVC extrusion with a wall thickness of .060 inch , the vinyl basement slider sill riser provides the basis for our aesthetically pleasing, equal light, glass panel design between the fixed and the sliding sash. The design utilizes a solid, snap fit leg construction to avoid shipping damage or loss. This design also allows for unobstructed drainage clearance under the sash panel.