The adapter allows you to replace 1/4" thread with a 3/8" thread.
Thanks to the adapter you can mount all accessories with 3/8" threads in places where 1/4" thread is available. For example: you can mount a photo head on a monopod equipped with a 1/4" camera thread.
A special notch guarantees accurate tightening of the adapter with a flathead screwdriver.

Dimensions:
Overall length: 7mm
Width: 9,5 mm