Designed exclusively for Tracker Boats Versatrack accessory rail mount system, the Extreme Max 3005.4146 Slider Base provide an excellent mounting point for your boats electronics, including fishfinders, depthfinders, sonar, and more! The mounting plate contains no pre-drilled mounting holes, ensuring that your application will not be hindered by existing mounting holes. Simply place your fishfinder, depthfinder, or other accessory along the mounting plate, mark the location of the mounting holes on the plate, and drill through it for an exact fit to your accessory! Its durable aluminum construction provides the strength needed to support your accessories and offers great protection against rust and other damage.