3 Inch Air Sander Pneumatic Polisher Machine Set Air Grinder Polishing Machine Tool Features: 1. High rotation speed, good polishing performance, suitable for mirror polishing. 2. Compressed air as the power, energy saving and environmental protection. 3. Strong power and not stuck, smooth grinding process. 4. Suitable for grinding and polishing of fine wood, stone, hardware, crafts, etc. 5. and practical, a perfect set of tools for polishing and grinding.     Specification: Item Type: Pneumatic Sander Material: Aluminum Alloy + Steel + Iron Speed: 2000rpm Air Consumption: 3.1cfm Disc Size: 3inch Air Inlet: 1/4" Air Pressure: 90psi Main Axis Threads: M6 Item Size: 24 * 17 * 4.3cm / 9.4 * 6.7 * 1.7inch Package Weight: Approx. 890g Package List: 1 * Main Machine 1 * Grinding Disc 1 * Wool Grinding Disc 1 * White Sponge Grinding Disc 1 * Yellow Sponge Grinding Disc 1 * Inlet Interface 1 * Wrench Note: Please allow slight error due to manual measurement. Thanks for your understanding.