... and large loading-bearing capacity, can be used in wharf,airport etc.Application:urban road, public squares, gardens, wharf, ... greater than 30mm is ok. with 50, 100mm recommended.Surface treatment:G - galvanizedP - paintedU - untreatedGrating standard:China: YB/ ... and Japanese standards are available. The products most commonly used for Belt corridor, storage shelf,Attic panel, trestle, guardrail, ...