Provides large area coverage with almost the same cleaning power as a solid pencil jet. High-pressure pencil jet rotates at approximately 4,000 RPM. Increases the effective cleaning pressure of pressure washer by up to 50pct. Unsurpassed at removing stubborn dirt and solvents. Fits Karcher gasoline pressure washers with a rating of 2600-3600 PSI. Not recommended for delicate or painted surfaces.