- Two new metal press in style spool pins, two felt pads and one bobbin tire. - These will fit Singer model 27, 28, 66, 99, 15, 15-91, 15-90, 15-125, 206, 306, 319 and many more. - Pins are about 1 7/8" long and diameter is about 3/16". - Bobbin tire outside diameter 29mm, inside diameter 15mm, thickness 7mm.