• 1.The lens support collar is customized to fit Canon RF 70-200mm f/2.8L IS USM and will not work with other lenses. The tripod ring has an inner diameter of about 81.5mm, the width is about 13.5mm, the net weight is about 165g • 2.The tripod mounting ring adopts original E(III) standard design, split structure, inner wall groove and 3M plastic film installed to reduce wear The knob has the same function as the original factory and the knob is screwed on the bottom to unlock it • 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