It''s made by metal with very high quality.
The UNC (Unified National Coarse Thread) is 1/4''
The tripod mount ring mount on the tripod, it helps you fix and balance your tele lens which is heavy or long lens hanging off the front of camera.
Fits Nikon and does have same construction.

Technical Details

Product Details

Package Dimensions
Width : 2 inch
Height : 2 inch
Length : 2 inch

Shipping Weight: 6.4 ounce (View shipping rates and policies)

ASIN : B07567YVWL