This is an 80mm extension adapter with a guide, made of aluminum (total length 100mm). It is lightweight and durable. It is compatible with standard 5mm base diameter rod tips (Shimano, Daiwa, etc.). The thicker pipe is 30mm long, the thinner pipe is 80mm long, the overlapping section is 10mm, the total length is 100mm, and the weight is approximately 2.6g. The inner diameter of the line guide is approximately 4mm, and the height is approximately 9.5mm. 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. If adjustment is necessary, please use aluminum foil, etc. (The holes are made slightly larger and the shaft is made slightly thinner to make adjustments easier.) ◆If you purchase multiple items, we will discount the shipping cost, so please comment in advance. Species...Smelt