Jorgensen 3748 Medium Duty 48-Inch Steel Bar Clamp Maximum opening capacity is 48 inches Maximum reach is 2-1/2 inches from edge of bar to center line of screw Maximum load limit is 600 pounds Ideal for do it your sellers, hobbyist, carpenters, cabinet makers, woodworkers, metalworkers and professional trades people of all types Adjustable Clamp Co. (founded 1903) is the manufacturer of the bar clamps and they are assembled with U.S. and foreign parts in our Chicago factory