we have variety of gully grating.we have sewer grid, channel grating.our products  class since A15 to D400.  we have 300*300/ 400*400/ 500*125/ 500*500/ 500*1000/ 600*600/ 600*630/ 700*700 / 750*365/ 750*415/ 800*800 etc.  the height from 20 to 160(mm).