... 40mm Thread Pitch:2.5mm,3.0mm,3.5mm Mechanical Rebar Splicing Coupler with 45# steel Materials: 45# carbon steel. ... Specifications: D14mm-40mm. Usege: rebar splicingISO:9001 NameValueBrandLangruiModelLRThread Pitch2.5mm,3.0mm,3.5mmThread Angle75 ... on the enlarged end.Third, use one rebar coupler to connect two rebar ends. Mechanical Rebar Splicing Coupler with 45# steel