1、INTEGRATED CHUCK: Air die grinder kit come with 6mm chuck, bring firm clamping, possess high concentricity and smooth rotation, useful and practical 2、SPEED CONTROL SWITCH: You can adjust the air intake size of the air die grinder according to your work needs to improve work efficiency, very flexible 3、DURABLE AIR INTAKES: The air intakes of the air die grinder are made of alloy steel material, which is hard and durable. There is a filter to prevent debris from entering 4、POWERFUL INDUSTRIAL GRADE PNEUMATIC GRINDER: 18000rpm spinning speed ensure efficient polishing and grinding. Equipped with a 1/4in air inlet for easy connection 5、MULTI HOLE EXHAUST DESIGN: Be cautious of the air outlet of air die grinder during use to prevent accidental injury from oil spray or excessive airflow