Features: Small and light weigh,easy to install and operate. Suit for 1/5 RC Car brushed/brushless motor which shaft is 8mm. 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 M5 set screw has been added to each pinion gear. Specifications: Brand: KingVal Height: 14mm Diametral Pitch: M1 Suitable shaft diameter: 8mm Material: steel Teeth Size: 45T ?8*?47*14mm 46T ?8*?48*14mm 47T ?8*?49*14mm 48T ?8*?50*14mm 49T ?8*?51*14mm Package Includes: 5PCS Gears Combo with Screws