We are using these clamps in combination with manufactured VESA mounts to hold various size monitors on 1.5" Schedule 40 pipe columns. The clamps are precisely made to the OD of the pipe and clamp tightly with only hand tightening using the large wing nut. The clamps enable continuous vertical and rotational adjustments which are necessary in our application to reduce reflections from the monitors surfaces and to maximize screen brightness from specific viewing points.