Automatic Boom Barriers Gate Used in parking lot Stable running with ... to 6m, 1s, 3s, 6s 2.0mm Mild steel Automatic Boom Barriers Gate: Application:Parking lots, toll gates, goods yards, railway ... back when it meets any obstacle in its movement. Optional rubber arm can avoid any damage when arm touches anything. Additonal ... Distance>30mArm Speed1s, 3s, 6s(s=Second, m=Meter) Automatic Boom Barriers Gate