This square knob with a smooth surface and stylish concave sides will add a touch of modern flair to furniture and cabinetry. Please note that the screws included with the products are a standard size of 1-inch (25 mm) length, quadrex, pan head. They will fit with most of the popular melamine thicknesses, which range between 5/8-inches to 3/4-inches (16 mm to 19 mm).