Diameter | 5 3/4" (146 mm) , 4" (104 mm) and 8" (203 mm) | Inner hole | 7/8" (22,23 mm), 12mm, 1''(25.4mm) | Main pitches used for chain saws | 1/4, .325, 3/8 Picco 3/8, .404 | Available Grinders | Oregon, Tecomec, Timbertuff, Jolly, Maxx, Franzen, Foley, Northern, Maxx, Silvey, Franzen and others. | Please make sure this wheel fits your machine before buying. | |