It is specially designed for Canon RF600mm F11 IS STM RF800mm F11 IS STM Lens.
100mm length arca swiss quick release plate for tripod ball head of Compatible with Ball Head of RRS / ARCA-SWISS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE fit .Thickness of the base plate is 8.5mm/0.33in.
Bottom is also with 1/4"-20 and 3/8"-16 holes for mounting directly on a tripod,ball head,light stand,etc.
Thumbscrew knob with 1/4"-20 screw for connecting to lens.A built-in locating pin to well locate the lens in place.
Made of Aviation aluminum, CNC precisely machined, anodized surface.Size:100mm*38mm*26mm / 3.9in*1.5in*1.0in,weighs 70g/0.16lb.