Three steps forward/ one step reverse regulator set position close to operatior's finger allows the operator easy to adjust required power to the job. / Rear exhaust design directs air away from work piece and operator. / Ergonomically designed handel and trigger location help to reduce operator fatigue. / Special heat-treatment of major part & anvil last long life for work. / Soft rubber grip handle reduce fatigue to the web of hand and remain best balance for long time operation.