Machine Vise, Precision, Swivel Base, Jaw Width (In.) 6 in, Jaw Opening (In.) 7 1/2 in, Throat Depth (In.) 1 3/4 in, Jaw Deflection 0.001 in @ 4000 lbs, Bed/Base Parallel to 0.002 in, Locking Design Provides Half Pound of Downward Pressure for Every Pound of Clamping Force