Features: 3 standard for your option: single screw 30mm/single screw 32mm/double screw 32mm. Heavy duty and weather-resistant, product can withstand harsh weather conditions, prevent rust. Comfortable: strong and smooth, well Polished without burr, comfortable touch-. 316 stainless steel external Eye ends, Great for your boat or kayak canoe Rigging. Marine boat fittings- are easy to assemble and install. No drilling or welding required. Specifications: Material: stainless steel Standard: single screw 30mm/single screw 32mm/double screw 32mm(optional) Note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xBimini Top Cap