Robinson Racing Products (RRP) 48P Absolute Pinion, 21T
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Super hard Absolute steel pinions gears are a must for running with steel spur gears or will last and last if run with a plastic spur gear. Tooth number stamped on each pinion. 1/8 inch bore. One 5-40 set screw included. 1/16 inch allen wrench (not included) fits the 5/40 set screw.