This bracket is for total station users that do a lot of layout work or large topo surveys. With this bracket you will never have to move your data collector from leg to leg as you move around the tripod. The bracket connects between the tripod head and instrument tribrach. It fits all heavy-duty, full-size tripods. The brass 5/8" x 11 extension is conveniently stored in the unit when not in use. Your data collector mounts on the post with any Seco pole clamp. The plate is made of stainless steel and rotates smoothly 360 degrees. The body is machined anodized aluminum.