The MPR-192 Double Dovetail by RRS accepts Arca-Type clamps on the top and bottom and can be used as a camera body plate for some medium and large format cameras, or as a lens plate for any foot that does not exceed 6.75". It features a optional MPR-C flange which can be installed in 10 different positions to prevent twisting, and a high-contrast bull's-eye spirit level for precision. The MPR-192 has a 2.72" slot length for adjustability and a laser-engraved scale in 1mm increments on both sides for easy repetition of settings.