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: KingValHeight: 9mmDiametral Pitch: 48DPSuitable shaft diameter: 3.175mmMaterial: Steel Teeth: 33T 34T 35T 36T 37T Height: 9mm Gear size: 33T ?3.175*?18.55*9mm 34T ?3.175*?19.08*9mm 35T ?3.175*?19.61*9mm 36T ?3.175*?20.14*9mm 37T ?3.175*?20.67*9mm Package List: 1 x 33T Gear 1 x 34T Gear 1 x 35T Gear 1 x 36T Gear 1 x 37T Gear 1 x Screw set