Size:230 Product Information:Product Name: Hexagon Socket Head Cap ScrewsMaterial: IronSurface Treatment: GalvanizedHead Type: Hex HeadYou will get:/b>80pcs 410mm60pcs 510mm30pcs 610mm20pcs 6 15mm20pcs 617mm9620mm pieces5 820mm pieces 825mm pieces 6Installation notes:/b>Need to drill a small hole of suitable size with an electric drill,Use a hex wrench to screw it into the hole,Then add 2-3 mm of glue towood 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 fully tighten the ’nut, After that, the nut won’t loosenpitch 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 may be turned beyond the depth of any part of the end of the nut.