Material: Metal Packing list 1 x upper gasket 1 x lower gasket 1 x protective cover 1 x anti-thread nut High quality materials: Made of high quality metal, stable performance, high reliability and not easy to corrode. Easy to install: Use this attachment kit to attach the trimmer blade to the rotary head. Easy to use: The product is easy to use and very useful. It is stable and reliable and is a good replacement kit. General Accessories: Upper and lower spacers, protective cover, anti-thread nut mounting kit fits most lawn mowers. Scope: Suitable for most lawn mowers, brush cutters and paper shredders.