Vises Screw Jacks & Braces Screw Jacks Permalift Raising Screws Turning Bars Screw and Caps Sholder Nuts Straght Nuts Mine Roof Jacks Tank Jacks Hydraulic Jacks Braces Red-I-Post..., hardened jaws, coupled with its Acme threaded screw and nut give an extremely powerful grip. These vises may be mounted to a workbench, or to the optional Stand/Work Table... is not essential. C-Clamps are I-beam design for maximum strength. Bright plated malleable iron frames, with steel screws, swivel pads and cross handles. PRODUCT NUMBER STAND HEIGHT...