GoolRC GoolRC M1 5mm 15T 16T 17T 18T 19T Pinion Motor Gear Combo Set for 1/8 RC Car Brushed Brushless Motor For 5mm shaft 1/8 RC car brushed brushless motor Hard anodized on the gear surface Rust-proof treatment on the surface of gears The gears are milled by precisely Tanwai milling machine Teeth: 15T 16T 17T 18T 19T Suitable shaft diameter: 5mm