WHAT YOU WILL GET This high trimmer parts set includes 1 x thrust washer / 1 x backing plate / 1 x collar nut / 1 x screwdriver, it does exactly what it should and is well built EASY TO USE, Easy to install and use. 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 with the original APPLICABILITY Kit Washer plate maintenance kit adapter attachment for STIHL trimmers