... . high quiality2. low dust,protect environment3. easy to operateShotcrete machine:Shotcrete machine, cement throwing jet ismainly used in construction for tunnel, swimming ... pool, wall etc.this shotcrete machine is wisely used in mines, tunnels, culcerts, subway, hydropower ... pine inner diameter 51mmWeight 600kg Automatic DYPG-5 Gunning shotcrete machine