WHILE USING A 1 1/2"" AIR IMPACT TO TIGHTEN T BLOCK BOLTS ON TO THE HOIST DRUM, THE BOLT SHOULDER AND HEAD CAUSED CUTTING OF THE MILD STEEL. WASHER. PARTICLE OF RUST FROM THE WASHER BECAME AIRB ORNE AND ENTERED THE EE'S EYE BEHIND HIS SAFETY GLASSESS.