HPI Racing Z684 Flange M4 Lock Nut (HPIZ684)Product DescriptionUpgrade you out. With stop nut M4 with fl. (4) make your model building skills with professionally parts from Markenherrsteller LRP Electronic GmbH to the next level. From the ManufacturerHPI specializes in the kit type R C car or truck, which can come already assembled or in kit form, meaning you build it yourself or with a friend. While the kit R C cars and trucks cost more at first, they are more durable and faster than toy R C