Impact Rammer Jumping Jack Tamper Tamping Gasoline Engine Recoil Starter Impact Jack Rammer Recoil Starter Engine power: 3-6.5 HP ; Impact force also known "ramming force": 1000N Percussion rate (ramming frequency): 450~650 times/min ; Jumping stroke (leap height): 40~65mm Forward speed (advancing speed): 10-13m/min ; Ramming plate size: 300 x 300mm Quantity: 1 ; Unit overall dimension: 18''L x 28-3/4''W x 47''H