Product Feature: . Application: Use with ALL of the following Motors: M.SR, M.SRM, M.SRB | M.TX, M.TXM, M.TXB | M.LX, M.LXM, M.LXB also use to replace these older discontinued 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 . Function: This set is S-93 Inner Shaft & S-77 Outer Sheath replacement parts, used for the maintenance of your flex shaft motor. The inner shaft sits inside the outer sheath and transfers power from the motor to the hand piece. .
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