Item Type: Boat Tube Base_x000D_ Material: 316 Stainless Steel_x000D_ Application: Can be used on ship, yacht, fibreglass boat, inflatable boat, other boat and sunshade. _x000D_ Through Hole Size: 25mm (1in)_x000D_ Base Aperture: Approx. 7mm / 0.28in_x000D_ Base Size: Approx. 81.5 x 47mm / 3.21 x 1.85in_x000D_ Product Height: Approx. 43mm / 1.69in_x000D_ Wall Thickness: Approx. 3mm / 0.12in_x000D_ Surface Treatment: Accuracy polishing. 1Standard Size: This 90 rectangular tube base has 1in through hole, 81.5 x 47mm base size and 43mm height, ensuring firm fixing. 2Good Material: Forged with 316 stainless steel, the hand rail fitting has great durability against corrosion in the saline water. 3Broad Utility: Allows for extensive application on ship, yacht, fibreglass boat, inflatable boat, other boat, sunshade and so on. 4Great Process: Having been through accuracy polishing treatment on the surfaces, the tube fitting has mirror effect, very pretty. 5Easy to Install: Comes with 7mm installation holes, the handrail base can be securely fastened by screws.1 x Boat Tube BaseThis product is made of stainless steel, and needs regular inspection and maintenance during use.