The FEISOL VH-60 Horizontal Adapter requires a 1.5" diameter column to convert your Large Classic or Elite tripod for horizontal use such as when shooting portraits, product shots, macro photography, and copy stand shooting. Supporting approximately 12 pounds, the adapter screws onto the 3/8" mounting screw of your tripod, and features engraved markers and a locking knob for accuracy when panning the full 360° range.