This Part is a direct replacement for any of the following Foredom motors: M.SR, M.SRM, M.SRB M.TX, M.TXM, M.TXB M.LX, M.LXM, M.LXB Item can also be used to replace broken or worn sheaths on these older discontinued Flex Shaft Motors: M.SR, M.SRM, M.SRB-1/8HP models sold prior to Nov. 2005 M.L, M.LM, M.LB M.PG M.S, M.SM, M.SB M.CC, M.MM, M.DD M.R, M.RB M.K M.500, M.900 and M.990 JETS Product # 0616-77 Sale is for a New and Original Foredom Part