... :50-100mm 2# to 23# hot dipped galvanized steel grating(factory)Hole shapes: Long holes, round holes, triangle ... explosion-proof, prevent slippery properties is good.Application: Prevention for road, railway, airport, residence district, seaport, garden, ... 1987Australia: AS1657-1985 Platform,trench cover,tair tread ,fence ,pavement gratingType:W--welded steel grating L-- pressure-locked C-- socket ...