The fixed size is the same as the 5# nylon zipper. The length of the perforated cloth is about 13cm. The square pin is fixed to the root. The four pinholes are respectively penetrated in the middle. The square must be in place. Otherwise, the defective products are easy to appear. The head should be matched. If a special puller is encountered, it is recommended to try the matching before the big product is produced. If the needle is off-center or the part is broken, the solution will be pressed in different directions.