This is a butt box & double anchor base compatible with Gamakatsu's grouper rods (Grand Impulse, Gamakue Impulse, Dora, etc.). 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 will provide stronger fixation. (When installing with only one hole, use the smaller hole.) The base is threaded, allowing for slight height adjustment. Although the adjustment range is not large, you can raise and lower the rod tip to some extent by slightly adjusting the butt end. *Note: 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 are M10, 3/8 to M12 compatible. ■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 reduces the risk of breakage. → #Other FMW products are here [Sea Bream, Ara, Grouper fishing, bottom fishing, bottom fishing, piton, Ishizuki BOX, rod rest]