Material: the hexagon socket nut is made of color galvanized carbon steel, high hardness, not easy to deform, corrosion resistance, good fastening effect, and can be screwed easily. Features: The nut has high strength and impact resistance, and is more stable when connecting with wooden furniture, effectively prevents loosening, and can be firmly fixed for a long time. Overall size: 8 different screw sizes , M4 10mm 80, M5 10mm 60, M6 10mm 30, M6 15mm 20, M6 17mm 20, M6 20mm 9, M8 20mm 5, M8 25mm 6 (inner diameter length quantity). Safety tips: drop glue into the hole (on the side wall), insert and rotate the nut several times, apply glue to the threads of the nut, then fully tighten the nut so that it is flush with the wood. Flat and as dry as possible. Field of application: Suitable for soft wood such as pine, counterp lacquered, wood fiber panels, etc. (a small hole must be drilled before installation).