The Short Action Customs Barrel Vise ARCA Mounting Base is the foundation for the Modular Barrel Vise kit and other accessories. SAC developed this base to be easily mounted an a variety of surfaces ranging from a milling machine table, to a bench top, to a custom platform. With 4a ^2 hole spacing and two machined and countersunk holes for 1/2a ^2 bolts, this base mounts anywhere you want to put it. After installed, this base allows you to secure any item with a standard ARCA dovetail. Chassis, optics and other Short Action Customs ARCA accessories are easily secured.