Jorgensen 3748-HD Heavy Duty Steel Bar Clamp, 48-Inch Maximum opening capacity is 48 inches Maximum reach is 3 inches from edge of bar to center line of screw Maximum load limit is 1,000 pounds Ideal for do it your selfers, hobbyist, carpenters, cabinet makers, woodworkers, metalworkers and professional trades people of all types Pony Tools Inc. (founded 1903) is the manufacturer of the bar clamps and they are made with U.S. and foreign parts in our Chicago factory