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.
RING: Advanced CNC processing,High quality Anodized aluminum alloy

Color: Black
The UNC (Unified National Coarse Thread) is 1/4" and 3/8"

Suitable For:
Sony FE 70-300mm f/4.5-5.6 G OSS(SEL70300G)

Item Included:
Lens Tripod Mount Ring x 1