Employees were installing grating that consisted of 4 sheets (approximately 4 feet by 5 feet), cumulatively weighing approximately 800 pounds. When the employees disconnected the load from the crane, they realized the corner of the grating rested on the edge of an existing guard rail toe plate. The injured employee attempted to lift the grating upwards while his coworker used a spud wrench to shift the grating off the toe plate. The grating shifted and caught the injured employee's left index finger between the grating and structural steel. He suffered an avulsion to his left index finger flesh beneath his fingertip, which was crushed and cut. He required surgery and was hospitalized overnight.