We can supply Window Sills (Granite Window Sills, Granite Threshold) as per your customized requirements. Material:natural granite, ... line on the back surface.Popular granite stone colors for window sills:G602, G603, G664, G687, G635, G636, G614, G655, G654, G611 ... , stone lintel, and stone mullions, which are compatiable with the window sills.In addition, we can also supply you other granite products ...