This is a guided 50mm extension adapter (total length 70mm). It is lightweight and durable. It is compatible with general 5mm base diameter rod tips (Shimano, Daiwa, etc.). The thicker pipe is 30mm long, the thinner pipe is 50mm long, the overlapping part is 10mm, the total length is 70mm, and the weight is about 1.8g. The inner diameter of the line guide is about 4mm, and the height is about 7mm. Since it is handmade, there may be slight variations. ★ Even with the same 5mm base diameter, there seem to be slight differences in thickness depending on the manufacturer. If adjustment is necessary, please use aluminum foil, etc. (The holes are made slightly wider and the shaft is made slightly thinner for easier adjustment.) ◆ If you purchase multiple sets, we will discount the shipping cost, so please comment in advance.