21T 0.8Mod 1/8 Bore CNC Steel Pinion Gear (ARA311083)

This 21-tooth, 0.8 modulus CNC steel pinion gear is designed to tune the gear ratio on 1/8-scale RC vehicles.

Machined from durable steel with a wide tooth profile for smooth engagement, it fits 1/8-inch (3.175 mm) motor shafts and features a threaded hole for a set screw. An M4 x 4 mm set screw is included to secure the gear in place, and the tooth count is laser-etched for quick identification.