This diffuser turns your flashlight's focused beam into a diffused light source--perfect for camping, reading, or area lighting.  I have tested a lot of the soft silicone type diffusers, and I prefer this hard plastic type.

This fits and works great on a wide variety of Convoy tube style lights including M2 and M21B.  It may also work on many other similarly sized tube-style lights.  

Dimensions:

Outside Diameter: 40.5mm
Inside Diameter: 34.5mm