Fine-tuned positioning comes easy with a handle-operated slide that moves the seat forward or backward, paired with 360-degree rotation and a knob lock for a custom fit and clear view. Built from heavy-duty aluminum alloy, the thickened base resists deformation and corrosion to handle spray and humid marine conditions. Pre-drilled holes line up with the deck for quick, secure mounting. Sized for 2-7/8-inch diameter base posts, this slide mount pairs with a compatible pedestal base to complete the setup and fits a wide range of boat seats on fishing boats, yachts, and canoes. Stainless steel screws are required base post and screws are not included.