【Speed Adjustable 】The HH-G01 features 400-8000 strokes per minute, a throttle bias adjustment valve for tailoring throttle response, and a dual-stage precision air regulator. Advanced ergonomics include front air pressure adjustment, An advanced valve pulse unit that operates with virtually no noise or vibration 【Double Ended】The HH-G01 has connections for two impact handpieces and an auxiliary air connection for other air tools, including Rotary handpiece. Two handpieces and one foot control come with HH-G01 【Wide Application】- It is suitable for jewelry, crafts, wood, wrought iron and other industries and is a perfect tool for engravers.