Stens # 085-0857 Silver Streak Pro Spur Sprocket for CARLTON N6-MC-644-SS, GB MC446-R6N, GB MC446-R60, HERR N174M6, MCCULLOCH 215252, REF NO SMC446-16NCARLTON N6-MC-644-SS, GB MC446-R6N, GB MC446-R60, HERR N174M6, MCCULLOCH 215252, REF NO SMC446-16N Sold on Amazon