The 4pcs adapters are nice accessories for weed trimmer head, applicable to most models. Features: Applicable to most models, but not all. Please note that the bottom washer has 6 teeth, please check the parameters carefully before using. Mainly used for weed trimmer heads with 1 inch (25 mm) mandrel, such as round weeding heads, 6 steel razor blades. It includes: 1 lock nut, 1 cavalier plate, 1 thrust washer and 1 thrust plate protective washer. Made of durable steel, long service life. Specifications: Material: Steel Collar nut diameter: 25mm / 0.87in Thrust washer diameter: 42mm / 1.65in Rider board diameter: 73mm / 2.87in Package Weight: 150g / 5.29ounces Package Size: 80 * 80 * 50mm / 3.15 * 3.15 * 1.97in Replacement parts are as follows: Thrust washer: 4130-713-1600; Knight plate: 4126-713-3100; Collar nut: 4126-642-7600. Replacement for FS120 FS130 FS130R FS200 FS200R FS250 brush cutter. Packing List: 1 * Thrust Washer 1 * Knight Board 1 * Lock Nut 1 * Thrust Plate Protective