Material: The glass shelf pegs are made of zinc alloy, have high corrosion resistance, are rustless, and featured a suction cup, for easy installation.Advantage: The silicone suction cup sticks to the glass face, soft material will not scratch the glass. It is mainly used as a non-slip and cushioning effect of the glass laminate, and the suction effect is not large.Application: Glass shelf pins are great for solid wood, plywood, plastic and glass plate, widely used on wine cabinets, display cabinets, bookshelves, closets, shoe cabinets, and so on. Suitable for glass shelves.Pin Diameter(Approx): 5mm/0.20 inch; Pin Length(Approx): 9mm/0.35 inch; Fit for board thickness(Minimum): 9mm/0.35 inch; Please install on a straight horizontal surface.Package Content: 20pcs x Shelf Support Peg . 20pcs x silicone suction cup.