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