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1 piece aluminum 64 pitch pinion 21 teeth.

The "Pro" Pinions are precision machined from 7075 grade aluminum and anodized with a super hard jet black finish that not just hardends the surface but also protects the gear from corrosion and increases the lubricity by reducing friction and adhesion between the pinion gear and spur gear. 1/8 inch bore. One 5-40 set screw included.

Manufacturer: Robinson Racing (4321), length: 8.8 mm, center bore: 3.18 mm, thickness gear ring: 4.3 mm

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