Brocraft Low-Profile Swivel Mounting Base / Downrigger Swivel Base , Composite components and stainless steel construction make the standard model as strong as it is versatile, designed to endure the roughest fishing conditions . 16-point 360° swivel base that locks every 22. 5° for 360 downrigger rotation . Pre-drilled and tapped for easy installation ，Fit Cannon , Brocraft Downrigger . Low profile design maximizes available space