Automatic Boom Barriers Gate Used in parking lot Stable running with low noise ... 6m, 1s, 3s, 6s 2.0mm Mild steel Automatic Boom Barriers Gate: Application:Parking lots, toll gates, goods yards, railway crossings ... than compressed spring in heavy-duty site where barrier gate will open and close continously. AC motor can support ... 30mArm Speed1s, 3s, 6s(s=Second, m=Meter) Automatic Boom Barriers Gate