1.Good quality 2.Competitive price 3.Suitable for High way ,Railway; Outside of factory; Parkland Grazing district ... length20-25 Color seriesCommon color:red,yellow,blue,green,white,black,gray;Optional color:RAL265 colors Installation wayC20 concrete pouring, ... Unit: MM PS: This data only for reference, please ask more details from our engineers Suitable for: High way ,Railway*** Airport ,Military ...