DOP73V072GPA Loop-Saw Chain. Vanguard™ Chisel Chain. 3/8" Pitch, .058 Gauge, 72 Drive Links. Fits Partner model 1655, 2055, 550, 650, 7000, P100, P65, P70, P85, R-20, R-21, R-22, R-23, R-30, R-35, R-40, R-416, R-420, R-421, R-435, R-440, S-50, S-55, S-65 Chain saws.