4.0mm Strut with Rudder . For 4.0mm Shaft Outrigger, O, etc.. Adjustable Angle and Height, Inside built with 2x Bearing. Included 4mm Flex Shaft, 10mm Tube, 2mm Pull Rod, Rubber Seal set, Water In-take Rudder. M4 / 4mm Drive Dog Version Material: Aluminum Alloy