[4 Piece Gearbox Blade Retainer Kit]: Package Included 1 x Jumper Plate, 1x Thrust Washer, 1x Flange Nut, 1 x Screwdriver. [Part Number referenced]: The thrust washer is compatible with 4130-713-1600; Jumper plate is compatible with 4126-713-3100; The flange nut is compatible with 4126-642-7600. [Compatibility]: Compatible with STIHL FS55 FS56 FS85 90100110130 trimmer gear head, etc. [ Durable and compact]; Made of galvanized steel, perfect replacement kit. [Note]: Not all FS 55 56 models are applicable, please confirm the size before purchasing. Good quality product< /p>