Features: Small and light weigh,easy to install and operate. Suit for 1/10 RC car brushed/brushless motor which shaft is 3.175mm. High quality aluminum 7075,hard anodized on the gear surface,more durable and wear-resistant. 5Pcs set gives you more choice and make your RC car have best performance. A M3 set screw (12.9 level) has been added to each pinion gear. Specifications: Brand: KingVal Teeth: 21T 22T 23T 24T 25T Height: 9mm Tip Diameter 21T: 12mm 22T: 12.5mm 23T: 13mm 24T: 13.5mm 25T: 14mm Diametral Pitch: 48DP Suitable shaft diameter: 3.175mm Material: Aluminum 7075 Package List: 1 x 21T Gear 1 x 22T Gear 1 x 23T Gear 1 x 24T Gear 1 x 25T Gear 1 x Screw set