Compatible: for Stihl FS36, FS40, FS44, FS55, FS55C, FS55R, FS55T, FS56, FS56C, FS56R, FS70, FS72, FS74, FS75, FS76, FS80, FS83, FS85, FS87, FS90, FS90R, FS94, FS100, FS110, FS110RX, FS120, FS130, FS200, FS240, FS250, FS260, FS460, FR85, FR85T, FR130T, FR220, FR350, FR450, FR480, FR410C, FR460TC, FSA90, FSA90R, FSE65, FS-KM. Two Different Adapter Kits: Blade Adapter Attachment Kit: 1 x Thrust Washer(10 teeth)/ 1 x Rider Plate/ 1 x Collar Nut(0.315inch inside diameter)/ 1 x Screwdriver. Blade Adapter Kit: 1 x Thrust plate guard washer (6 teeth)/ 1 x Thrust washer/ 1 x Rider plate/ 1 x Lock nut(0.3inch inside diameter). kit bag: Two different sets of adapters can basically meet the needs of weed trimmer. The 2 different inside diameter of collar nut is 0.315inch and 0.3inch. If you need to replace the blades, you must buy these sets of parts. Perfect kits for your string trimmers. Quality Material: blades kit is made of high quality carbide tipped material. Sharper and more durable, impact and wear resistance. Easy to use and install, suitable for organizing your garden or for agricultural purposes. Easy to Install: Replace the string spool on the trimmer for the stihl blade adapter kit. The blade fit tight and there was very little vibration. Besides, can through Youtube videos to use it. Adapter Attachment Washer Plate Maintenance Kit Replacement For STIHL String Trimmers blade adapter kit