The BV-6M milling vise from Baileigh Industrial is built to last years in any shop. Built with versatility in mind- the BV-6M milling vise has many features that other vises at this price don't have. 5-3/4 Milling Vise Includes swiveling base Can be removed from swivel base for fixed mounting All steel and Cast-Iron body Reversible jaws for external work holding ??? maximum jaw opening 11-7/16" Mount Spacing (5/8" bolts) 77 lbs