New Norton Commando MK3 850 rear sprocket. This rear Norton sprocket is made by the OEM manufacture in England - Andover Norton and replaces Norton part number 06-6011 and 066011.Sprocket comes with a black painted finish - ready to install / no mods. Accepts a 5/8" X 3/8" (530) chain. Fits MK3 Norton 850 Commandos only. Check your parts book to ensure the best fitment.