... Description of trench cover,steel grating,grate,bar grating,drain cover,stair tread,steel grate HENGZHOU's extensive ... area thusachieving a hydraulically effcient grate.Grating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, ... 25, 45, 50, 60, 60.32, 80, 100Cross bar pith(mm)38, 50, 76, 100, 101.6Thickness(mm ... chambers…… trench cover,steel grating,grate,bar grating,drain cover,stair tread,steel grate