FMW Double Anchor Base. Compatible with W3/8 nuts. Bolt holes accommodate M10, 3/8 to M12. Material: Super Super Duralumin ■ About the Material Made of super super duralumin, a lightweight, high-strength material also used in aircraft. Its specific gravity is only 2.8g/cm3, less than half that of stainless steel (7.93g/cm3), making it lightweight. Furthermore, its tensile strength is approximately 570N/mm2, higher than stainless steel's approximately 520N/mm2. Each piece is produced by machining from the raw material, which inevitably increases the cost, but eliminates welding points, reducing the risk of breakage. → #Other FMW Products are here 【For fishing for Japanese seabream, longtooth grouper, giant grouper, bottom fishing, pitons, rod tips, rod holders】