Material: The hexagon socket nut is made of color galvanized carbon steel, high hardness, not easy to deform, corrosion resistance, good fixing effect, and can be easily screwed. Features: The nut has high strength and impact resistance, and is more stable when connecting with wooden furniture, effectively prevents loosening, and can be securely fixed for a long time. Overall size: 8 different sizes of screws, 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 wood glue into the hole (on the side wall), insert and rotate the nut several times , put glue on the thread of the nut, then tighten the nut completely so that it is flush with the wood. Flat and as dry as possible. Scope of application: Suitable for wood soft such as pine, plywood, fiberboard, etc. (a small hole needs to be drilled before installation). Installation Notes: Need to drill a small hole of appropriate size with an electric drill, Use a hex wrench to screw it into the hole, Then add 2-3mm of wood glue to the hole (on the side wall). Insert the nut and turn it several times, Then place 2-3 mm of glue on the thread of the nut, Then turn the nut 180 degrees, Please tighten the nut completely, After that, the nut will not loosen and is firmly connected to the wood.