"SET OF TWO MOVEABLE AND ONE FIXED JAW; MANUFACTURED OF HIGH-STRENGTH ALUMINUM WITH A TENSILE STRENGTH OF 80,000 PSI AND A BRINELL HARDNESS OF 160; WILL NOT RUST AND OFFERS BETTER MACHINABILITY AT 1/3 THE WEIGHT OF STEEL; EXCELLENT VEBRATION DAMPENING QUALITIES WHICH IMPROVE SURFACE FINISH AND ACCURACY; VERTICAL AND HORIZONTAL KEYS ARE MACHINED IN THE JAWS TO PROVIDE REPEATABLE JAW POSITIONING TO WITHIN .001 IN. WHEN JAWS ARE SNAPPED ON AGAIN; 2 IN. HIGH,5 IN. WIDE,7 IN. LONG"