In China, the connection method between guardrail beams and  posts include two types: hex spacer block type and bracket type.

The Bracket type is commonly used in rural road or narrow road.

Specification:

Normal Size	3 Hole Bracket: 70*300*4.5/4.0mm 5 Hole Bracket: 300*270*35*6.0mm
Material	Steel Grade Q235B(equivalent to S235JR/ASTM A283M Gr.D)
Surface treatment	Hot dip galvanized or powder coated
Zinc coating	550g/m2 or as per your request
Application	It’s commonly used in rural road or narrow road.

There’re other types of bracket used for Z post and Sigma post.

Z post bracket

Sigma post bracket