Feature: 1. WEAR RESISTANT AND STABLE: High accuracy chucks are durable, not easy to wear, possess high concentric rotation speed, stable operation, no slant grinding 2. ADJUSTABLE SPEED: Air intake volume adjustment, free control speed, speed control through intake air volume, to deal with different working conditions 3. WIDELY APPLICABLE: Can be used for grinding and polishing, grinding tires, removing solder joints, and smoothing. Suitable for deburring of finished products in mold factories, tire factories, shoe factories, and metal processing industries 4. TECHNICAL PARAMETERS: Rated pressure is 90PSI, no load speed up to 20000rpm, equipped with 3mm and 6mm collet 5. CORROSION RESISTANT STAINLESS STEEL: Stainless steel material possess corrosion resistance, good mechanical properties, high strength Specification: Item Type: Air Die Grinder Material: Stainless steel Chuck Size: Approx. 3mm / 0.12in, 6mm / 0.24in Rated Pressure: 90PSI No Load Speed: 20000rpm Uses: Grinding, polishing, machining, repairing, rust removal . Package List: 1 x Air Die Grinder2 x Wrench1 x Collet1 x Connector Note: Drop 2‑3 drops of pneumatic lubricating oil into the air inlet before and after each use, and then idling for a few seconds to complete maintenance.