Garelick/EEz-In Blue Water Adjustable Height Ribbed Series Positive Pin Lock Pedestal - 12" - 17" Pin Secures Base At Specific Height In 1" Increments Stainless Steel Lock Pin Locates Securing Hole Easily Anodized Protective Finish Helps Prevent Saltwater Corrosion And Weathering 2-7/8" (7Cm) Diameter Ribbed Stanchion Tube, 9.25" (23Cm) Diameter 6 Hole Base Plate 12" - 17" (30 - 43cm) Height