This is an aluminum variable adapter. It is compatible with general 5mm diameter rod tips (Shimano, Daiwa, etc.). (The insertion opening of the rod tip is made with an inner diameter of 5mm. Please be aware of Varivas, Creek, etc.) ○ Uses 40mm long 5mm and 6mm diameter aluminum pipes. ○ The inner diameter of the line guide is approximately 4mm. ○ A spring washer is used to prevent loosening of the threaded part. ○ Weight: Approximately 4.7g Since it is handmade, there may be slight variations. ★ Even with the same 5mm diameter, there seems to be some difference in thickness depending on the manufacturer. If adjustment is necessary, please attach aluminum foil, etc. (Photo 7) ※ The hole is made slightly wider and the shaft is made slightly thinner for easy adjustment. ◆ If you purchase this item with other sets, we can reduce the shipping cost, so please comment in advance.