WHAT YOU GET This mower parts kit includes 1 x Thrust Washer / 1 x Backing Plate / 1 x Flange Nut / 1 Screwdriver, it does exactly what it’s supposed to do and is well built EASY TO USE , easy to install and use br/> EASY TO INSTALL, it is easy to replace the line spool on the trimmer with the rigid blade adapter kit. The blade was well adjusted and there was very little vibration. ADAPTATION AND PROTOTYPING, Perfect match to the original APPLICABILITY Kit Adapter support washer plate maintenance kit for sizes - edging STIHL