... ≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3, 25X4, 25X4.5, 25X4.7, 25X5…..40X6, 40X8, 40X10,….90X6….Pitch of Load ... is not limited to above.1.4 Grating type: Bearing bar: Plain type, Plain I type, Serratd type, Serrated I type; Cross bar: Square twisted ... Most of machine were imported from Japan, Germany,Switzerland,etc.5. Capable design can make grating customized according to site requirement ...