... box ,flushing box , sizes: 3"x3" ,3"x6"20mm/ 25mm knockouts color : white material : pvc 1) name:swithc box, 2 gang box , 1 gang box,flushing box ... ,wall box2) sizes: 3"x3",3"x6"box ... surface mounting ,control box , switch box or general service box 3x3 box , pvc material . 200pcs/outer packing 3x6 box , pvc material , ...