sourcing map Frame Turn Button, 7/8" Metal Flat with Screws for Hanging Pictures, Photos, Drawings and Posters, 50 Pcs (Black). [SIZE]: 0.75" (19mm) in length, 0.33" (8.5mm) in width, 0.035" (0.9mm) in thicknes; Mounting Hole Diameter: 3mm / 0.12" [APPLICATION]: Widely used for hanging pictures, photos, drawings and posters. [EASY TO INSTALL]: No need to drill holes, just use screws to tighten the button on the photo frame. Mounting screws are included here. [NOTE]: When screwing the screw, the screw should be perpendicular to the frame surface. [MATERIAL] - Made of good quality metal, electroplating finish, anti-corrosion, good wear resistance.