Durable Plastic Construction - Made of ABS material for long lifespan , light weight and easy to carry it. Easy Installation - Come with pre-drilling screw holes can easily mounts to any flat surface. 30 Degree designed head for quick rod adjustment. Unique Design - It is Perfect Design For the Kayak Canoe holders ect to help position your rod in a more natural manner. Works Great -Includes rubber gasket with ,Sealed bottom prevents leaking through the rod holder. Specification - Color: Black. Base Length: Approx 102mmm / 4.0 inch, Hole Diameter: Appro x 45Mm / 1.8 inch, Height: Appro x 270mm/10.6 inch Package Includes: 1 Piece Boat Flush Mount Rod Holder Note: 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.1-0.5 inch difference due to manual measurement.(1 inch=2.54cm) 3.The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding.