• 1. The tripod ring is customized to fit Canon RF 28-70mm F2L USM and will not work with other lenses. Support vertical shooting, but can't rotate • 2. The net weight of the tripod mount ring is about 185g, the inner diameter is about 74.5mm, the width is about 18.5mm, the overall one-time molding, the 3M plastic protective film is installed. Locking knob with non-slip design • 3. The bottom of the lens bracket collar has a 70mm long Arca Fit quick release plate for direct use with 39mm Arca Swiss Fit tripod ball head, panoramic head and clamp. More practical than lens support collars with no anticut • 4.On the bottom of the lens support collar there is 1/4" and 3/8" screw holes and stainless steel non-slip screws to secure the lens directly to the tripod • 5. The tripod socket is made of aviation aluminum, CNC precision machined, hollow out lightweight design, polished and anodized surface. The appearance and exquisite workmanship is much better than similar products made in molds