Size:14mm/100PCS DIY Tools: The kit can provide you with an economical solution for repairing tarps, awnings, tents, canvas, swimming pool covers, etc. It is easiest to set the rivet holes of the awning in place using a punch and mandrel. Durable and easy to use: The hole cutter and chuck are made of solid metal and can be used for a long time; Each set of metal tarp rings and washers fit well, won't break or be easily lost. There is a storage box: Comes with a plastic storage box, very suitable for storing small size buttonhole tools, easy to find and retrieve them when sewing. of the manual installation method: 1. Prepare all necessary materials. 2. Drill holes with drilling tools 3. Install the buttonhole on the base. 4. The fabric is passed through the hole and placed on the base. 5. Cover the shell with a mold 6. After placing it vertically, use the installation tool to press carefully Please press vertically, otherwise the tool will be easily damaged.) 7. Touch the opposite side first , then press forward As the perforation is very thin, excessive force should be avoided during installation to prevent damage to the perforation. Reminder: If the fabric is very thick, you can use tools such as scissors to simplify the operation. Note: During the operation, the edges will be sharp and the fingers will be cut carefully. For the small parts, please keep them away from children and avoid swallowing them by mistake. Avoid wearing a grommet in a humid environment.