... Crowd Control Barriers O/D 25 , 32, 40, 42, 48 Thickness : 1.7mm 1.8mm 2.0mm etc Finished : hot-galvanized Galvanized Crowd Control ... BarriersCrowd control barrier Size:1.0m.2.0m,2.5m Diameter:325mm Thickness ... and 48mm4) Designed to be filled with concreor water 5) Color: blue ,yellow ,red etc