Top Base Diameter: 64mm Height: 27mm Net. Weight: 189g Mounting Thread: UNC3/8" Max Load: 20KG Product Features SUNWAYFOTO IRC-64 panoramic indexing rotator panning clamp combines the advantages of indexing rotator and panning clamp. It is compact , light yet precise. The scale with laser-engraved centering index marks can precisely master any angle variation during each shoot in horizontal rotation, the aligned scale on the jaw is for accurately controlling the nodal point during the panoramic photography in different focal lengths. So the panoramic photography could be more accurate and highly efficient.