Specification: Item Type: Round Edge Hinge Material: Zinc alloy Applicable: Folding table top, sewing machine table, etc. Thickness: Approx. 2.2mm / 0.09in Service Life: Opening and closing more than 30,000 times Weight: 168 g / 5.9 oz(approx.) Package List:4 x Round Edge Hinge24 x Screw Features CORROSION RESISTANT MATERIAL: 4 Pieces of round edge hinge is made of excellent zinc alloy material, has smooth surface, bright, corrosion resistant, rust resistant, durable WITH SCREWS: 90 degree folding table hinges are mounted with screws, set includes 24 screws for mounting for your convenience 180 DEGREE HINGE: Round edge hinge has high hardness, wear resistance and corrosion resistance, which opens at 180 degrees and closes flush MAIN USES: Hinge fits on a variety of tables, including computer tables, coffee tables, window, doors, closets, folding tables and more EASY TO USE: The two plates are aligned and then positioned, the hinge size is measured, the groove is dug, and the screw is fixed. The hinge is completely opened into the horizontal state(180 degrees), can also be completely closed, does not have the in