ZK-SW300DC including one control box and two swing arm which suitable used in one channal(width 4~6) with
two doors,it mean one swing arm support one 2~3m width door with 300kg
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ZK-SW300DC including one control box and two swing arm which suitable used in one channal(width 4~6) with
two doors,it mean one swing arm support one 2~3m width door with 300kg