Features and Benefits Allows you to hem the aluminum door window flange opening with minimal arm fatigue; New Air Hammer driven door skinning tool for the window flange opening of aluminum doors that is easily affordable for every auto body technician; The Al Skin Zipper2 can now skin the window opening which could not be done in the past with its self-lubricating reinforced Nylon head that will crimp regular or adhesive bonded skins; The reduced height of the guide allows Al Skin Zipper2 to accommodate the step that is commonly in window opening areas that are not easily accessible with other tools; Saves the technician arm fatigue and time by easily hem the window opening with minimal refinish required to paint and/or reapply e-coating;