Works with Various SOLE Treadmill Models PART # 022497V1 ABOUT: Magnetic, Round, Red TreadLife Fitness makes safety keys for Less! Soles makes A LOT of different keys for their different treadmills, this will work on models listed below in description TreadLife Fitness makes safety keys for Less! WORKS ON: 006 Series - F85 (585881), 2008 Series - VF63 (563887), 2009-2010 Series - WF63 (563888), 2009-2010 Series - WF83 (583888), 2009-2010 Series - WF85 (585888), 2009-2010 Series - WS77 (577888), 2009-2010 Series - WTT8 (588888), 2013 Series - F63 (563812).