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