Alpha Jack Clamps, manufactured in Montana by Lowell Thomas Tools Inc., can act as both a jack and a clamp. The Jack Clamp offers a versatile, easy to use and adjustable tool for woodworkers, cabinet installers, shop class instructors, furniture builders, DIY applications and more. The clamp has multiple configurations to tackle a wide range of projects including cabinetry and kitchen sink installation, hanging picture frames and more. The Alpha Jack Clamps have a 13" throat depth, which allows users to clamp around stock when working on delicate and intricate projects, says the company. Each clamp weighs about three pounds and includes a horizontal and vertical level on the fixed end. The bottom bar includes a ruler calibrated in inches and millimeters.