What is this? The binding screw posts are perfect for various DIY projects, leather crafting, clothing making, or as a versatile fastener to connect different items. Examples include photo albums, leather bags, wooden board connections, furniture installation, and more. What will I get? The Hex Chicago Screw Posts Set we provide here applicable hole dia: 3/8"(10mm); thread size: M8 x 20mm; socket size: M8 x 15mm; cap diameter: 16 mm / 0.63inch; cap thickness: 3 mm / 0.12inch; thread pitch: 1.25mm / 0.05inch; total length: 23 mm / 0.91inch; strength level: 4.8; material: carbon steel In the package of 10 Set x Binding Screw Posts; 1 x Hex Wrench Are there any advantages of the product? Made of 304 carbon steel, wear resistance, high hardness, and good decoration. Hex socket head bolts, with clear threads, provide stability, and can be used for a long time. Resistant to slipping, easy to tighten and remove. How to use it? Drill a hole between 0.5-1mm larger than the diameter of the socket nut, put the screw and nut on both sides of the locked object, and use the hex wrench to lock it. What should I notice? The thickness of the object being secured, must be less than the length of the screw rod & nut rod, otherwise, it will not be able to tighten.