M lock mount kit supports both 18650 and 21700 battery lights with interchangeable screw lengths,
Short Screw Compatibility.
For 18650-battery flashlights (barrel diameter: 22-24mm) likeTA20, TA21, TA30C, etc.
Long Screw Compatibility
For 21700-battery flashlights (barrel diameter: 25-29mm) LikeTA30C MAX, P80, P81, etc.