It is used for office stationery, leather goods, apparel, arm belts, etc. It mainly has the functions of combination, connection, fixing, and wear resistance. When the screw post is used in binding booklets, photo albums, etc., first make a hole at a suitable position, the hole is 0.5mm larger than the diameter of the nut rod of the binding bolts. According to the thickness of the booklet, select the screw corresponding to the length of the nut rod, and insert the two ends into the holes to connect and lock. APPLICATION: It is perfect for thin albums, decorative bags, leather belts, sandals, boots, leather bags, helmets, etc.Fit for all kinds of art and leather crafts and DIY clothing production. INSTRUCTIONS: Make a hole larger than 0.5mm than the diameter of the nut rod, put screws and nuts on both sides of the locked object, and select the appropriate tool to lock it. ADVANTAGE: Precision mechanical thread, made of high-quality stainless steel material,anti-rust. Our screws are an important addition to any leather clothing or accessories. Colour: silver Material: stainless steel Package Contents: 40 x single screw (M6 x 20mm) 40 x pair lock nuts (M6 x 18mm) NOTICE: Use post screws to lock, the thickness of the lock must be less than the length of the screw rod + nut rod, otherwise, it will not be locked.