This belt fits most Singer 15, 66, and 99 machines, and others with the disk type (not spoked) handwheel. Belt is long-lasting black rubber and is V type, 15 3/8 Inches long.
Also fits 15-88, 15-90, 185J, 185K, 185N, 192, 192K, 206, 206K, 306, 306K, 306W, 319, 327, 328, 329 with 15 3/8 Inch long belt.