This is a 60mm 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 60mm long, the overlapping part is 10mm, the total length is 80mm, and the weight is approximately 1.8g. 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. If adjustment is necessary, please use aluminum foil, etc. (The holes are made slightly wider and the shaft slightly thinner to make adjustments easier) ◆ If you purchase multiple sets, we will reduce the shipping cost, so please comment in advance.