A plastic tube and plug for M4 threaded Hitachi mounts. 15mm in diameter Tube.
A 15mm Hitachi mount can be inserted securely to the plug and then protected by the tube. Ideal for storage as well as mailing.
The internal diameter of the tube is 0.83" (21mm). The Outer measurements of the tube are: 0.9" (23mm) x 2.05"H (52mm).