This is a 64 pitch 63 tooth pinion gear from Precision Racing Systems. Ultra precise pinion gears machined perfectly round. Constructed from light 6061 aluminum then hard Teflon coated black. 8 additional "lightening" holes have been added to reduce the rotating mass. No messing with the normal 0.050 allen wrench, these take the large 0.062 tip wrench that are used on your 4/40 button head screws.
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