1,shape:c channel 2,galvanized steel channel 3,slotted and plained 4,high quality 1,made of ... ,various kinds of fitting can make up of many combinations8,strut channel size 41*41mm 41*21mm9,wall thickness:1.5mm ,2 ... .5PZ414141*41*1.541*41*2.041*41*2.5 strut channel