This is a 50mm aluminum extension adapter. It is lightweight and durable. It is compatible with a base diameter of 5mm. The thicker pipe is 30mm long, the thinner pipe is 50mm long, the overlapping section is 10mm, the total length is 70mm, and the weight is approximately 1.6g. Since it is handmade, there may be slight variations. Even with the same base diameter of 5mm, there may be slight differences in thickness depending on the manufacturer. If adjustment is needed, please use aluminum foil, etc. ◆ If you purchase multiple sets, we will discount the shipping cost, so please comment in advance.