This is an aluminum variable adapter. It is compatible with standard 5mm base diameter fishing rod tips (Shimano, Daiwa, etc.). ○ Uses 40mm long aluminum pipes with 5mm and 6mm diameters. ○ The inner diameter of the line guide is approximately 4mm. ○ A spring washer is used to prevent the screw part from loosening. ○ Weight: Approximately 4.8g Since it is handmade, there may be slight variations. ★ Even with the same 5mm base diameter, there may be slight differences in thickness depending on the manufacturer, but it is tapered to accommodate a wide range. ◇ If adjustment is needed, please attach aluminum foil, etc. (Photo 7). ◆ If you purchase this with other sets, we can reduce the shipping cost, so please comment beforehand.