automatic arm barrier 1.Max length of boom: 6m 2.Time for up/ ... ( for 4~6m) 3.color is optional,low noise automatic arm barrier,Parking barriers,Safety barriers,Security barriers,BS-306(AC) / BS ... .2.We specialize in Automatic door& gate opener since 1998.3.Our main products are traffic barrier,garage door opener,swing gate ... east ,South Africa etc.8.ODM/OEM service is welcome. automatic arm barrier