The FishEng Rail Slider is designed to fit River Wild Boats 3/4 x 2 1/2-inch rails and Alumaweld boat gunnels measuring 1/4 x 2 1/2 inches, ensuring a secure and stable fit with minimal play, so rods won't rock drastically back and forth in their holders. Constructed from black anodized aluminum, this Rail Slider is built for durability and long-lasting performance. Note that this product is the Rail Slider only and does not include a sliding rail system. It is not compatible with Willie Boats rails. Each pack contains one Rail Slider.Fits River Wild Boats 3/4 x 2 1/2-inch railsFits Alumaweld boat gunnels 1/4 x 2 1/2 inchesSnug fit; rods won't rockMade from durable black anodized aluminumNot compatible with Willie Boats railsQuantity per pack: 1