Package Content: 1 x Collar Nut, 1 x Thrust Plate, 1 x Rider Plate, 1 x Beveled Washer, 1 x Screwdriver, perfect kit for easy replacement and repair. Size -- Screwdriver Size: 121mm/4.77inch; Rider Plate Diameter: 80mm/3.15inch; Beveled Washer Diameter: 80mm/3.15inch; Collar Nut Diameter: 25mm/0.98inch; Thrust Plate Diameter: 42mm/1.65inch. Good Compatibility -- Stihl blade adapters are suitable for Stihl 55, fs 55r, fs 56, fs 56rc, fs56 rc-e, fs 66, fs 70r, fs 76, fs 85, fs 90, fs 90r, fs 91, fs 91r, fs 110, fsx110, fs 130R, fs 131, fs 240, fs-km, 4mix. Easy to install - Easily replace the line spool on the trimmer with the Stihl blade adapter kit. The blade was well adjusted and there was very little vibration. Application - This is the perfect set for your garden tool accessories, which is the nice replacement accessory for your Stihl to help you scrape a large area of brambles, nettles, weeds in your garden.