A 1-inch air impact wrench features very high torque (often over 1500 ft-lbs) for heavy-duty tasks like truck tire removal and industrial equipment maintenance, a robust 1-inch square drive for powerful fastener removal, pneumatic (air-powered) operation requiring a substantial air supply, and a durable, industrial-grade construction. Other features can include variable speed controls, auxiliary handles for better grip, and specific clutch mechanisms designed for powerful impact.