Strength Grade: 4.8; Main Color: Bronze Tone; Thread Diameter: M6; Under Head Length: 70mm / 2.76"; Thread Length: 50mm / 2"; Nut Size: 9.5 x 13mm / 0.37" x 0.52" (D*L); Screw Size: 11.5 x 72.5mm / 0.45" x 2.85" (Max.D*L); Fit Hex Key Size: 4mm / 0.16" Advantage: Well-built, solid hardware compatible assembling most beds, tables, chairs or workbenches, etc. Application: compatible joining most woods, boards, kitchen worktops, cabinets, cupboards, and a variety of other DIY projects. Material: Make of carbon steel, manufactured by cold compatibleging, with precise thread structure and high strength, the surface ados a strengthening process, electro-galvanized coating, corrosion resistance, and beautiful appearance. Installation: 1. Make a hole on the wooden board according to the outer diameter of the nut and install the nut. 2. Make a hole compatible another wooden board, align it with the installation hole of the nut, insert the screw lock nut, and the installation is complete.