1.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. | 2.It features an Arca-compatible dovetail plate that allows you to attach your lens to ball head, clamps or panoramic head of the Arca-Swiss standard. | 3. Made of aviation aluminium alloy and CNC precision machining,built-in non-slip patch to protects your lens. | 4.Compatible Lens:for tamron 50-400mm f/4.5-6.3 di iii vc vxd lens(A067),for tamron 100-400mm f/4.5-6.3 di vc usd lens for canon ,for tamron 100-400mm f/4.5-6.3 di vc usd lens for nikon. | 5.Reserved multiple 1/4"-20 & 3/8"-16 thread screw holes at the bottom for attach lens to tripod directly.

1.This tripod mount ring helps fix and balance your tele lens which is heavy or long lens hanging off the front of camera. | 2.It features arca swiss bottom plate for attaching your lens to Ball Head, Clamp or Panorama Head of Arca-Swiss standard.There are also 3/8″-16 and 1/4″-20 holes at the bottom for attaching on tripod,light stand,etc | 3.Made of aluminum alloy.Ring dia is 80mm/3.1in,weighs 188g/0.41lb. | 4.The tripod collar bottom is added 50mm long Arca fit quick release plate feature, compatible with Arca-Swiss 39mm fit tripod ball head, panoramic head and clamp directly; more practical than lens collars without QR-Plate. | 5.Package includes: 1 x Lens tripod mount ring

It features Arca-compatible dovetail which allow you attach your lens to Ball Head, Clamp or Panorama Head of Arca-Swiss standard | Flannel attached to the inner ring Protect the lens | Designed with Arca-compatible dovetail, photographer could set up camera and lens quickly. | Aluminum Lightweight materials Adopting anodized aluminum and advanced CNC machine precision machining | This tripod mount ring helps fix and balance your tele lens which is heavy or long lens hanging off the front of camera.