Profiwellenanlage3,2mm Flexwe Graupner 2372 3.2 mm Ø flex-shaft, 8 mm Ø aluminium stern tube, aluminium coupling for 5 mm Ø motor shafts, adjustable- height aluminium motor mount designed for SPEED 500 / 600 motors, triple ballraced. Drive Dog driver for 3/16" propellers. The 50 cm long stern tube can be shortened to 20 cm, and can be curved to follow the profile of the hull accurately. Suitable for the PX-1 racing catamaran,the B-28 and comparable racing model boats.