Robinson's Aluminum Pro pinions feature lightweight aluminum construction with
an added hard coating that produces extra strenght and less friction. These
pinions also feature a hollowed out core that reduces rotating mass for improv-
ed acceleration and deceleration. Available in 48 pitch from 12 to 35 tooth
sizes, and in 64 pitch in 16 to 47 tooth sizes.
1 64pitch pinion 39 teeth
1 4-40 set screw
0.050 size hex wrench such as GPMR8000.