This is a 70mm aluminum extension adapter. It is lightweight and durable. It is compatible with a 5mm base diameter. The thicker pipe is 30mm long, the thinner pipe is 70mm long, the overlapping part is 10mm, the total length is 90mm, and the weight is approximately 2.0g. 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. ◆ If you purchase multiple sets, we will discount the shipping cost, so please comment in advance.