Product Description: All metal construction and anodizing aluminum process, durable for long time use. anodized aluminum adapter M48 female thread to M54 male thread adapter. Converts an M48x0.75mm male thread to a M54x0.75mm male thread. OR Converts an M54x0.75mm female thread to a M48x0.75mm female thread With it you can convert a female M54x0.75mm thread to a female M48x0.75mm thread with minimum possible mechanical length.<br><br>External Thread: 5.5mm(M54x0.75mm) InternalThread: 5.5mm(M48x0.75mm) Overall Length: 5.5mm Material: Metal colour: Black<br><br>Package Contents: 1 x telescope accessories<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.