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ProTek R/C Steel Mod 1 Pinion Gears are an affordable pinion gear option that doesn't skimp on quality. CNC machined from hardened steel material, these precision cut gears are durable and are perfect for any Mod 1 pitch application. Available in 11 - 20 tooth variants, these gears feature a 5mm bore with the tooth count engraved on the gear for easy identification. Plus, each gear includes a set screw to make installation easy.