Palmgren 12321 QV30 Quick Vise, 3.0-Inch Made from FX25, fine grain cast iron; Hardened cam mechanism permits up to 1,500 lbs. of clamping pressure Adjusting screw for custom clamping force; Precision-ground guide bars for smooth, precise travel and clamping; Jaw surfaces square to 0.002" Solid iron construction with stress-relieved design; Replaceable jaw plates Center of base is open for work holding through vise; Slots or bolt-lugs for secure mounting