... 45# high-quality carbon structural steel.3.Type: Standard Type, Left-Handed&Right-Handed Type, Reducing Type.4.Suitable Rebar: ... Saudi Arabia, Vietnam,etc. AdvantagesHigh quality raw material ensure standard rebar coupler. CE Certification has passed through.Strict quality control ... steel, for example, HRB335, 500.5Mpa is up to standard. Suitable for different countries’ steel. Simple to operate. ...