Item No NVK-5123 Description This is Novak's 5mm Mod 1 Steel Pinion Gear 3-Pack (18T/19T/20T) (#5123). These hardened gears are available in packs of three gears, allowing drivers to experiment with gear ratios. In addition to the added flexibility, the three-gear packs save money by giving drivers the ablility to purchase a pack of gears, instead of buying individually. Novak's 5mm Mod 1 Steel Pinion Gears: 18T-20T are, overall, shorter in length to easily fit into all popular brushless 1/8-scale vehicles. These shorter gears allow uses to take advantage of the lower Kv generated by the HV Sintered Tuning Rotor with 5mm Shaft - 14mm. Additionally, the vehicle's gearing must be decreased for an overall lower gear ratio. All of Novak's Mod 1 gears include a set screw and have the gear size marked for easy identification.