Billet Door Handles, Window Cranks, & Vent Window Cranks Billet Specialties new generation of door handles, window cranks, and vent window cranks are, without a doubt, the best on the market. All are fully positionable, all you do is mount the spline on the regulator, slide the aluminum cover over the spline, align the arm to the proper position, tighten, and snap on the dome cover.