This optional flex shaft sheath is 63-1/4″ in length so you will have approximately 2 extra feet of reach if you replace the standard length sheath for this.  Of course you have to change the inner shaft at the same time.  This is available for use with the CC, DD,K, L, LB, LM, LX, LXM, LXB, PG, PGX, R, RB, S, SB, SM, SR, SRM, SRB, 1/8HP SR, 1/8HP SRM and 1/8HP SRB (the 1/8HP units were sold prior to 2006) TX, TXM, TXB units.  Measures 66″ long.  Must be used with a 66″ flexible inner shaft sold separately.