This professional heavy-duty vise has a quick release mechanism for one-handed operation. A single counter-clockwise turn disengages the screw so you can position the work with one hand while quickly adjusting the vise with the other. A single clockwise turn engages the screw to allow for final tightening. Solid steel dog in the front jaw can be used in conjunction with a bench dog stop to allow oversize work to be held securely on the bench top. Machined, toes in jaws provide a solid grip. The front and back jaws have tapped or countersunk holes to allow for optional wood facings. Vises can be installed on 2-1/4" bench tops; thinner tops will require blocking and thicker tops must be mortised to allow for proper installation. Machined jaws have a durable baked enamel finish. Max opening 12".