This is a butt box & double anchor base compatible with Gamakatsu's grouper rods (Grand Impulse, Gamakue Impulse, Dora). Basically, it can be used with a single anchor. However, if the installation location has weak rock quality, such as sandstone, using a double anchor provides stronger fixation. (When installing with only one hole, use the smaller hole.) The base is threaded, allowing for slight height adjustment. The adjustment range is not large, but even slightly raising or lowering the rod butt can raise or lower the rod tip to some extent. ※Caution: Even when raising the height, always screw in at least 8 rotations so that the head of the screw protrudes from the joint. If the screwing is insufficient, there is a risk of detachment. Manufacturer: FMW Material: Super Super Duralumin Bolt holes support M10, 3/8 to M12. ■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 of stainless steel's 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 item is produced by cutting from the material, so the cost is inevitably high, but the absence of welding points reduces the risk of breakage. → #Other FMW products are here 【Sea Bream, Japanese Amberjack, Grouper fishing, bottom fishing, bottom fishing, piton, Ishizuki BOX, rod rest】