Using this product is easy. First, remove your old seat - post bolt. Then, choose the appropriate length bolt from the set (25mm, 30mm, 35mm, or 40mm) according to your needs. Insert the bolt into the seat - post binder and tighten it properly. Remember, the M8 bolt needs a 5mm Hexlox, which you'll need to provide yourself. As for maintenance, keep the bolts clean and dry to prevent rust. If you notice any signs of wear or damage, it's a good idea to replace the bolt right away to ensure your safety and the proper functioning of your seat - post.