... quality and reasonable price 2. Professional produce and various designs 3. Good after-sale service steel grating, grating manufacturer & specialist, Best ... , 20, 23.85, 25, 30, 30.16, 30.3, 32.5, 34.3, 35, 38.1, 40, 41.25, 60, 80mm etcUS standard ... :JIS galvanized steel grating, bar grating, stair treads, trench cover-3