Machine Vise, Quick Release, Fixed Base, Jaw Width (In.) 4 in, Jaw Opening (In.) 4 in, Throat Depth (In.) 1 1/2 in, Overall Length (In.) 13 in, Overall Height (In.) 3-1/2 in, Clamping Force (Lb.) 200 to 1200, Jaw Plate Parallel to 0.001 in with Recessed Steps for accurate positioning of small work pieces., Adjustable Screw Provides Variable Clamping Force