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The Best Product to Save Your Time and Money! Specifications: Material: Stainless Steel 304 Color: Silver Punch Diameter: 10mm/0.4" Eyelet Inner Diameter: 16mm/0.63" Thread Size: M6 x 70mm/0.24" x 2.76" (D*Bolt Length) Package Content: 6 x M6 Expansion Hook Bolt Installation Methods: Select a chopping bit with the same diameter as expansion screw casing, and install it on the electric drill for punching. The depth of the hole should be equal to the length of the bolt. Then insert the expansion bolt set into the hole. Remember: Do not screw off the nut and prevent the bolt from falling into the hole when the drill is too deep. Tighten the nut for 2 to 3 buckles and unscrew the nut when expansion bolt si very tight without any looseness. Then the fixed items are mounted with perforated fixed part and installed aiming at bolt. The gasket or spring washer outside is used to screw the nut tightly. Welcome to our store! Enjoy quality and healthy life! We dare to use the new, heart, innovation to supply the best quality products! Any problem please feel free to contact us first so that we can supply the best service for you.