Product Description: All metal construction and aluminum process, for long time use.High quality 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. External Thread: 5.5mm(M54x0.75mm) InternalThread: 5.5mm(M48x0.75mm) Overall Length: 5.5mm Material: Metal colour: Black Package Contents: 2 x telescope accessories 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. OR Converts an M54x0.75mm female thread to a M48x0.75mm female thread Converts an M48x0.75mm male thread to a M54x0.75mm male thread. Product Description: All metal construction and aluminum process, for long time use.High quality anodized aluminum adapter With it you can convert a female M54x0.75mm thread to a female M48x0.75mm thread with minimum possible mechanical length. M48 female thread to M54 male thread adapter. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.