Brocraft Aluminum Downrigger Bracket With Swivel Base For 90 Degree Boat Track System/Lund Sport Track/Versatrack Track/Ranger Track , Bracket Made by marine grade T6 aluminum alloy with CNC processing.Great for 90 Degree Boat Gunnel Track System : Versatrack, Lund, Ranger, and Lowe Boats . Swivel Base made by composite components and stainless steel construction make the standard model as strong as it is versatile, designed to endure the roughest fishing conditions .Swivel base 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