Abstract: A vertical vise adaptable for floor mounting and having two spaced posts. One post carries a stationary work piece engaging jaw on its upper end and beneath the jaw, a vertically adjustable work piece support cradle assembly. The second post is hollow and shorter than the first post. A clamping head positioning arm is pivotally secured in the cavity of the second post so that its upper end is swingable toward and away from the first post. The second post carries a screw which projects thereinto for forcing the positioning arm toward the first post. The positioning arm projects above the second post and carries a clamping head assembly which includes a movable work piece engaging jaw mounted on a lever which is cam actuated. In use, a work piece is inserted between the posts with its bottom edge resting on the support cradle and its upper edge projecting above the clamping jaws.