PROSHI needle scaler operates using compressed air. It attaches to a compressor and is designed to clean metal surfaces from rust and paint, particularly in hard-to-reach areas. The tool uses 12 hardened steel needles that work at a speed of up to 4,000 strokes per minute. It consumes 4 cubic feet of air per minute and features a 1/4-inch air inlet size. The operating principle is simple: compressed air moves the steel needles, causing them to oscillate back and forth, effectively impacting the work surface. For ease of use, the tool includes an ergonomic handle with a non-slip coating and a trigger button for control.