The Drive Flange by Poly Performance is competition proven and virtually unbreakable. The drive gears are machined from 4140 chromoly and heat treated for heavy duty strength and durability. The Drive Flange spline locking hub or drive gear assemblies. The drive gears can be removed, while the cap can be retained to disengage the axle from the hub. The kit comes with all stainless steel hardware and Poly Performance custom gear cover plate