... .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 ... Max aggregate size 20mmConveying pine inner diameter 51mmWeight 600kg good quality Gunning machine