Our 90° Patterned Clamping Mount offer a great way to attach our 0.625” diameter hollow tubes together. Eight equally spaced through holes are consistent with all of our other items that have the same 0.770” hub pattern. Precision machined from aluminum, these clamping hubs offer several advantages over set screw hubs. First, they do not damage the shaft which they are attached. Second, they offer more holding power in high torque applications. The included side clamping machine screws are 6-32 and accept a 7/64” hex key.