[High quality hardened metal&Work Smoothly]32P pinion gear set is of hardened metal construction. Last longer life. Good machining made less rough and less noise than other that make them roll smoothly. [Pitch & Teeth]32P compatible with 0.8 metric (0.8M) pitch. 32P(32DP) is the pitch of each tooth on the pinion gear and the 20T 21T 22T 23T 24T is the number of teeth on the pinion gear. Please make sure your spur gear and pinion gear have the same pitch, or the teeth 't mesh. [Compatible with]Compatible with 1/8 inch Hole, 3.175mm Shaft Size Motors, Make sure your RC motor shaft have the same diameter [Free combination]The speed depends on ration. We provide five different teeth pinion gear to make you more choice in gear ration. [Package Include]The package included 32p 20T 21T 22T 23T 24T pinion gear and a hardened hex key. Material: Metal colour: Black Package Contents: 1 x 32P Hardened Steel Pinion Gear Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.