... .reasonable price Description of trench cover,steel grating,grate,bar grating,drain cover,stair tread,steel grate HENGZHOU's extensive range of Trench ... the grate open area thusachieving a hydraulically effcient grate.Grating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, 30 ... ,trash rack grates ,paint backing chambers…… trench cover,steel grating,grate,bar grating,drain cover,stair tread,steel grate