$11.99 SP25MMCLAMP is compatible with mounts and holders accommodating the 25mm ball pattern (including Arkon Robust Series Mounts and RAM Mounts-sold separately). This package includes only the 25mm (1 inch) Swivel Ball to C-Clamp Mounting Pedestal. Install the C-clamp base on a tripod, desk, cart, worktable, bench, lectern, or other table-like surfaces. The C-clamp maintains a firm grip and opens as wide as 1.6 inches (41mm). Then attach 25mm ball compatible holder or other device (sold separately) to create a mount solution. Compatible with: Compatible with any device, shaft, or holder that utilizes a 25mm / 1 inch ball size. Compatible with all Quadlock 1″ ball mounting systems.