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