Patented Power Locks hold more pressure, longer. Provides 500 lb. of 1-handed force (900 lb. of 2-handed force.) I-beam bar resists twisting and bowing, allowing maximum force to be applied. Quick-Release trigger for nonexplosive pressure release. Quick-Change jaw converts quickly into a spreader. 3" throat depth accommodates larger workpieces. Nonmarring pads grip securely and protect workpiece finish.