This 39-1/4? long inner shaft should be used to replace broken or worn shafts on these discontinued motors: EE, GG, MMG 975, 980W, 981W Use with outer sheath S-80 sold separately. Replacement shafts require a VERY light coating of Foredom grease before use. Be sure to unplug your motor before doing any maintenance and never operate your Foredom without the outer sheath attached.