YT-09912 Series GRF Kit contents air hammer, hose connector, needle attachment Housing material aluminum Mass 2.81 kg sound pressure 97.0 ± 3.0dB(A) Acoustic power 108.0 ± 3.0dB(A) Vibrations 18.9 ± 1.5 m/s² Impact rate 4000 min⁻¹ Air flow required 99 l/min working pressure 0.63MPa Air connection diameter (PT) standard Inner diameter of the air supply hose 3/8" (9.5mm) Number of needles 19 Needle diameter 4mm Pneumatic needle hammer designed for cleaning rust, welds and sheet metal work. number of needles: 19 needle diameter: 4 mm weight: 2.8 kg connection diameter: 3/8" (9.5 mm) piston stroke: 4 mm stroke: 4000 strokes/min length without connection: 460 mm air consumption: 99 l/min