Composed with rotor,bases and sieve. Hammer head is fixed on hammer frame drum's arm with bolt and screws Main technical parameters of the GJP series of impact hammer series Specifications/parameters/Parameter itemsGJP800 X 400Rotor work diameter x width(mm)φ800X400Hammer head Average speed(m/s)38Maximum size of input(mm)60Hammerhead quantity(pieces)8Output size (mm)3mm