for shaft diameter 7.15mm
 Outside diameter 23.5mm
 Straight toothed.
 fit e.g. for Singer 502,506,507,509,522,527,
 600,6100,7100,2001,800,417,714,
 717,719,724,734,737,750,755,758,
 770,774,775,776,778,
 900,920,925,1036,6704,6705, Futura