GoolRC 48DP 3.175mm 16T 17T 18T 19T 20T Pinion Motor Gear for 1/10 RC Car Brushed Brushless Motor A m3 set screw(12.9 level)has been added to each pinion gear. Suit for 1/10 RC cars. Originally Aluminum 7075. Hard anodized on the gear surface. A m3 set screw (12.9 level) has been added to each pinion gear.