Yescom 52CC Gasoline Demolition Jack Hammer Concrete Gas Breaker Punch w/GS/EMC/NSAI Certificated Certification: GS/EMC/NSAI Engine Type: 1-3/4" x 1-3/8"(44mmx34mm), gas powered, single cylinder, air cooling, 2 stroke Fuel Mixture Ratio: 25:1 (25 gasoline: 1 motor oil) Fuel Consumption Rate:  0.6L/h, Impact Frequency: 770-1500 BPM, Impact Energy: 2055J Suitable for tearing up foundations, ripping up driveways, demolishing re-enforced, concrete floors or walls, breaking through solid rock, etc.