This utility corner jointing bracket makes assembling or taking apart panels a piece of cake. Great for holes with diameter 3mm or 5mm. 8 options for mounting, plus one locking screw hole. Made of 0.080 inch thick hardened steel. Bright zinc-plated. Dimensions: Size: 50mm x 42mm Height: 25mm Thickness: 2mm Hole Diameters: 7mm and 4mm A top notch bracket for panels!