• 1. Lens support collar is customized to fit Canon RF 600mm F11 IS STM and Canon RF 800mm F11 IS STM and will not work with other lenses. The lens tripod foot measures approximately 91mm(L) x 38.5mm(W) x 31mm(H) (without screws) and the net weight is approximately 95g • 2.The tripod mount ring stand is made according to the lens structure, the screw hole is precisely adjusted, and the anti-slip positioning pin design. It is locked by spring screws with corrugated handle • 3. The bottom of the lens bracket collar stand features a 45mm long Arca Fit quick release plate that can be used directly with the 39mm Arca Swiss Fit tripod ball head, panorama 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.Tripod socket base 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