All of Big Al’s windshield wipers are made from billet aluminum with a brushed finish. There are three different style arms to choose from with a variety of arm length options. All of our wipers are designed to fit either a 1/4” shaft, a #10-32 threaded shaft, a 1/2” shaft, or a 5/8” shaft. The multiadjustable arm was designed to have the option of cutting down the wiper extension so that you may get the exact arm length needed for your application. This arm has a maximum extension of Approximately 10 3/4” and may be cut down from there. The Original style arms and the Smooth Contour arms are all machined to a fixed length and the arm length is not adjustable.