Vibrating Rammer Specifications: Model ZDH20L Power (HP) 4 Rotate speed (r/min) 3600 Vibrant frequency(HZ) 78 Exciting Force (KN) 20 Moving speed (cm/s) 20 Impaction depth (cm) 30 Impaction efficiency (m2/h) 230 Exterior size (cm) 115*34*85