Происхождение товара
Hebei, China
Сплав или нет
Нелегированная
Особая труба
Толстостенные трубы
corrugated steel pipe parts
10.8 grade the best bolt(standard is 8.8 grade)
seal
top-level corrugated steel pipe seal
technology
German corrugated steel pipe technology
grade
1st corrugated steel pipe
materials
best steel board
galvanized quality
more than 84 um
service life
more than 100 years(corrugated culvert)