Size:230 Product Information:Product Name: Pan Head Screw hexagon socketMaterial: ironSurface treatment: galvanizedHead type: hexagonal headYou will get:/b>80 pieces 4 * 10mm60 pieces 5 * 10mm30 pieces 6 * 10mm20 pieces 6 * 15mm20 pieces 6 * 17mm9 pieces 6 * 20mm5 pieces 8 * 20mm6 pieces 8 * 25mmInstallation notes:/b>Need to drill a small hole of suitable size with an electric drill,Use a hexagonal wrench to screw it into the hole,Then add 2-3mm of glue to wood to the hole (on the side wall).Insert the nut and turn it several times,Then drop 2-3mm 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.Note: /b>The depth of the pre-drilled hole should be deep to the length of the inserted nut, and the bolt can be turned beyond the depth of any part of the nut end.