This is a joint for the FMW ishidzue (butt) box. Sold as a single part. Compatible with W3/8 bolts. Manufacturer: FMW Material: Super Super Duralumin ■ About the Material Made of super super duralumin, a lightweight, high-strength material also used in aircraft. The specific gravity is only 2.8g/cm3, less than half that of stainless steel (7.93g/cm3), making it lightweight. Furthermore, the tensile strength is approximately 570N/mm2 for super super duralumin, compared to approximately 520N/mm2 for stainless steel, boasting high strength. Each piece is produced by machining from the raw material, so the cost is inevitably high, but the absence of welding points reduces the risk of breakage. → #Other FMW products are here 【For fishing for ishidai (striped beakfish), ara (longtooth grouper), kue (longtooth grouper), bottom fishing, pitons, ishidzue (butt), rod holders】