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