Post Driver Petrol Fence Knocker Jack Hammer 4 Stroke Picket Fencing Rammer. 1.0kw 5000 rpm. 365mm / 36.5cm / 14.4. 737mm / 73.7cm / 29. 300mm / 30cm / 11.8. Subject to stock availability. UK Mainland orders placed by 2pm are dispatched on the same day. Orders placed after 2pm Friday will be despatched on …