... durable, easy to clean, convenient installation.Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, 25X4 ... .7, 25X5…..40X6, 40X8, 40X10,….90X6….Pitch of Load bearding flat bars(mm)12.5,15, 20, 30, 30.6, 32 ... , 70, 75, 80, 100, 101.6, 102……Grating type: flat bar: plain type, plain I type, serrated type, serrated I type; cross bar ...