Feed Dog Screws Compatible with Singer Industrial Sewing Machines. Part Number # : 208 Compatible with Singer models : 24-56, 24-70, 24-71, 25-54, 25-55, 31-51, 31-52, 31-53, 31-54, 31-60, 31-61, 31-63, 31-64, 31K19, 31K21, 31K47, 36-1, 36-3, 36-4, 37-2, 37-3, 37-4, 37-5, 37-6, 37-7, 37-8, 37-9, 37-10, 44-32, 44-33, 44-34, 44-35, 44-36, 44-37, 46K10, 46K14, 46K15, 46K29, 46K30, 46K31, 46K32, Scholastic Plus, 660A, 7312, 7322, 7350, 7380 Quilter, 770, 771, 8275, 8280, 8770, 95, 96, Centurion 121D You will receive 2 screws.