Bar clamp and spreaders"power locks" 3-1/4 inches throat depth clamp cap.6 m inchax open 14-5/8 inches I-Beam bar resists twisting and bowing allowing maximum force to be applied. Patented'Power Locks' hold more pressure, longer. Provides 550 lbs of one-handed force (900 lbs of two-handed force).' Quick Release' trigger for non-explosive pressure release.' Quick-Change' jaw converts quickly into a spreader. 3 inches throat depth accommodates larger workpieces. 7- 1/2 inches minimum spreading capacity. Non-marring pads grip securely and protect workpiece finish.