The "BTF Adapter (Split-Washer) for High Steer Arms" arms are CNC machined from cold-rolled steel.They were deigned to the same specifications as the stock GM part so they can be used with stock steering arms also.The side of the cone is spit on a mill to allow the adapter to crush to the diameter of the bolt and create the strongest joint possible.You will need 3 of these parts for each Dana 44 arm you purchase.Sold individually.