Vibration Frequency: 9,800 to 16,000 VPM (Vibrations Per Minute) depending on throttle load.Needle / Poker Head Diameter: Available in 25mm, 35mm, 45mm, or 60mm sizes. 35mm and 45mm are standard for slabs and columns.Flexible Shaft Length: Typically 4 to 6 metres, reinforced with an inner high-carbon spring wire core.Compaction Capacity: Up to 25 m3/hour of concrete pour volume.Fuel Consumption: ~1.4 Litres/hour at full 3,600 RPM operating speeds.