General description This Universal Brush Cutter Head Nut Set is designed for thermal brush cutters, including popular brands like Stihl, Echo, and Ryobi. It provides a reliable solution for attaching various types of blades to weed whackers, trimmers, and lawn mowers, ensuring efficient cutting performance. Technical specifications Brush Cutter Set Size: 5mm L Key Size: 128mm / 5.04" T Key Size: 140mm / 5.51" Driver Plate Diameter: 80mm / 3.15" Collar Nut Diameter: 25mm / 0.98" Thrust Washer Diameter: 42mm / 1.65" Condition: 100% new Material: Plastic + Steel Compatibility and accessories Compatible with Stihl models: FS40C, FS55R, FS56R, FS36, FS80, FS81, FS85, FS90, FS10, FS110, FS120, FS130, FS130R, FS200, FS200R, FS250, Sarlo SS-18 Package includes: 1x thrust washer, 1x bridging plate, 1x flange nut, 1x 5mm L wrench, 1x T wrench Installation Easy to install with the included maintenance kit Adapter mounting washer maintenance kit specifically for Stihl brush cutters