This geared column has a clamp that will fit a thickness of 18- 38mm. This allows you to attach a head and your camera to a table for small product work. Adjustable between 5cm and 66cm. Head not included. Attachment: 3/8'' screw; geared column. clamp range - max (rectangular tube): 0.71 in.; clamp range - min (rectangular tube): 1.50 in.; color: black; material: aluminum; maximum height: 25.98 in.; minimum height: 1.97 in.