Machine Vise, Uni-Grip, Fixed Base, Jaw Width (In. ) 4 in, Jaw Opening (In. ) 4 in, Throat Depth (In. ) 1 1/4 in, Overall Length (In. ) 11, Overall Height (In. ) 2-1/2, Clamping Force (Lb. ) 450, Jaw Deflection 0.010 in At 33 lb, Jaw Plate 0.003 in, Bed/Base 0.003 in, Can Be Positioned Anywhere on the Machine Table, Unigrip Mechanism Keeps the Overall Open Length of the Vise Irrespective of the Jaw Position, Unlike Other Vises with a Tommy Bar