Gardening Machine Lawnmower Stihl Blade Adapter Kit-thrust Washer, Rider Plate, Collar Nut, Maintenance Screwdriver, Blade Adapter Attachment Maintena What You'll 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 constructedSuitable Replacement: There are not an OEM part but alternatives parts and 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 reliabilityGood 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, FS250Gardening 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 inchEasy 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