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The Robinson Racing 32 pitch alloy pinion gears are not heat treated and should only be used with plastic spur gears. If you only run plastic spur gears these pinions are the perfect choice. The 32 pitch Alloy Pinion gears are not stamped with tooth number. 1/8 inch bore. One 5-40 set screw included. 1/16 inch allen wrench (not included) fits the 5/40 set screw.
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