Designed exclusively for Tracker Boat's Versatrack accessory rail mount system, the Extreme Max 3005.4402 Slider Base provides an excellent mounting point for your boat's electronics, including fishfinders, depthfinders, sonar, and more! The mounting plate contains pre-drilled mounting holes designed to fit common marine accessory mounting patterns; the plate may also be drilled to provide a custom fit for unique mounting patterns. Its durable aluminum construction provides the strength needed to support your accessories and protects against rust and other damage.