Description What Youll Get: This stihl trimmer parts set contains 1 x Thrust Washer/ 1 x Rider Plate/ 1 x Collar Nut/ 1 x Screwdriver, this does exactly what it should and is well constructed Suitable Replacement: There are not an OEM part but alternatives parts and guarantee durability performance save money. Thrust washer: 4130-713-1600; Rider plate: 4126-713-3100; Collar nut: 4126-642-7600. Perfect match for the original one. Easy installation, stable characteristics, high reliability Good Compatibility: A must have if you are buying the Renegade Blade. Helped out with fitting to Hus weed trimmer. Suitable for the following models: Stihl FS 40C, FS55R, FS 56R, FS36, Sarlo SS-18, FS81, FS 80, FS 81, FS 85, FS90, FS 100, FS 110, FS120, FS200, FS250 Gardening Machine Lawnmower Kit Size: Screwdriver size: 128 mm/ 5.0inch, Rider plate diameter: 80 mm/ 3.15 inch, Collar Nut Diameter: 25 mm / 0.98 inch, Thrust Washer Diameter: 42 mm/ 1.65 inch Easy to Install: Easy to replace the string spool on the trimmer with 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 For STIHL String Trimmers