Made of thickness 6mm sturdy steel plate, boom base offers a flexible method to support a 48mm vertical tube for setting the lights. The U-cut shape makes the base stackable for the convenience of storage and transportation. Large slot in the base offers a handy grip for handling. Accommodating O.D. 48mm tube or pipe, long receiver comes with two knobs for fixing the tube firmly. Caster (optional) is applicable on the base through the M12 hole at four corners.