Adjustable Boat Seat Support 11.7 to 17.7 Inches, Marine Base

【Height Adjustment】This adjustable boat seat pedestal features a four-level height adjustment system, ranging from approximately 11.7 to 17.7 inches (300 mm to 450 mm), to customize your seating position for optimal visibility or fishing comfort. 【Welded Steel Construction】This marine pedestal is constructed from welded steel with reinforced joints, making it durable enough to withstand demanding marine environments. Its protective black powder coating helps prevent rust and corrosion from moisture and exposure to fresh or salt water. 【Steel Locking Handle】Equipped with an integrated steel locking handle, this pedestal securely locks into place once adjusted. The ergonomic control allows for effortless vertical height adjustment while keeping the column securely in place. [Universal Swivel Base] Designed as a fixed, non-rotating pedestal base, this mount attaches directly to standard flat-bottomed swivel seat mounts. This configuration allows for the addition of a swivel function to suit your cockpit or passenger layout. [Compact Square Base] With a 6.75 x 6.75 inch (170 mm x 170 mm) mounting footprint, this support post easily installs on pontoon helm stations, yacht decks, and RV living spaces. It provides reliable stability for your seat on various types of watercraft.