Function: Propeller Nut Kit-allows you to quickly and easily replace and reinstall new propellers or broken pins. Package Contents: Including 2*support nuts, 2*small shear pins, 2*large shear pins, 2*washers and 1 wrench required for installation. Easy to use: This kit can be used to quickly and easily disassemble and repair props. This kit contains a variety of different sizes (refer to the details page for specific dimensions), which can be applied to most models on the market. Warm reminder: Please confirm the size before purchase, so as to avoid inappropriate size. Thank you!