Shallow Metal Box - Ceiling Fan Electrical Boxes 1:made with a versatile combination head screw 2:labor-saving installation ApplicationThese switch boxes are used to support toggle switches,duplex devices,decoratives and a veriety of electrical outlets.steel switch boxes with conduit knockout sizeCAT No.knockoutsizeendsbottomthicknessS50086-1/2"2-1/2"3-1/2"0.8mmS50106-1/2"2-1/2"3-1/2"1.0mmS50126- ...