... bar pitches may be 15 to 22, 25, 30, 32.5, 34, 40, 50, 60, 80, 90mm, of which 25, 30 ... and cross bar in longitude and latitude order to certain distance.Cross bar is pressed into the ... Antiacid and alkali corrosion capacity: the range PH6 to PH12.5, a stable protective film will be formed ... by installation fastener has the properties of easy to assemble and disassemble and of preventing destroying the ...