【Package includes】 There are totally 10 bolts sets and matching nuts in each card paper paqut, plus a six-pin key to help you complete the installation without trouble. It’s very convenient and pairing, point difficult to lose accessories. 【Anti rust and durable】 The binding screw post is made of high quality carbon steel, coating in Black, hard and durable powder. It is not easy to rust and can be used in wet places. 【Exquisite finish】 The bolt thread is clear and deep, without burrs, which can reach a fastening effect very strong; In addition, the inner hexagonal groove design can be well matched with the six-pin key to prevent slip during installation. 【Easy to use】 First, open a hole of 0 , 5 mm larger than the diameter of the nut rod, place the screws and nuts on both sides of the object to lock, and then use a hex key or a suitable tool to lock and terminate the attachment. 【wide application】 This binding screw position is suitable for thin photo albums, decorative bags, belts,