SK40 Rockage Hydraulic breaker post driver Operating Weight 649 lbs (295kgs) Striking Frequency (Blows per Minute) 500-900 bpm Hydraulic Oil Flow 11-18 GPM (40~90 Lpm) Working Pressure 2000 PSI Tool Diameter 2.7 Inch (680mm) Warranty 12 Month SK43 Rockage hydraulic breaker post driver Operating Weight : 826 lbs.(375kgs) Striking Frequency (Blows per Minute) 400-800 bpm Hydraulic Oil Flow 13-24 GPM (50~90 Lpm) Working Pressure 2200 PSI Tool Diameter 3 Inch (750mm) Warranty 12 Month