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 steel,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 Height: 9mm Diametral Pitch: 48DP Suitable shaft diameter: 3.175mm Material: Steel Teeth: 13T 14T 15T 16T 17T Gear size: 13T ?3.175*?7.95*9mm 14T ?3.175*?8.48*9mm 15T ?3.175*?9.01*9mm 16T ?3.175*?9.54*9mm 17T ?3.175*?10.07*9mm Diametral Pitch: 48DP Suitable shaft diameter: 3.175mm Material: Aluminum 7075 Package List: 1 x 13T Gear 1 x 14T Gear 1 x 15T Gear 1 x 16T Gear 1 x 17T Gear 1 x Screw set