Bobbin Case Star Disc for Singer Industrial Sewing Machine Classes: 31, 44, 95, 96, 111, 188, 195K, 196K, 211, 241, 245, 251, 281, 291U, 331K, 366K, 491 & 770.

Prevents bobbin from spinning after machine has stopped.

Also, Consew Classes: 30, 225 & 226.