CS Unitec's Trelawny VL203 Pistol Grip needle scaler operates at 2400 blows per minute with low air consumption - requires 5. 5 CFM at 90 PSI. Its performance as a corrosion inhibitor has been proven in the harshest environments on ships and rigs throughout the world. The VL203Includes 19 long-lasting chisel-tip needles, 3mm dia. each.Converts from a needle scaler to a chisel scaler in seconds with an optional kit.