Make from Aluminum Alloys, smooth, not easy to rusts and resistance. The screw with silicone tip will grip the glass more firmly. need drilling on glass, just fix the glass clip at wall, Put the glass in it and screw on, very easy and quick to install. Suitable for indoor and outdoor glass shelves, such as living room, shower room, school classroom, conference room, kitchen, wine coolers and other place. Widely used in fixed glass shelves, such as bathroom glass shelves, wine cabinets, display cabinets.