1,# 45 carbon structural steel 2, the special manufacture process, high precision size, quality ... 45 # high quality carbon structural, the special manufacture process, high precision size, quality is reliable.Can be connected Φ 14 ... JGJ107-in 2010 to 1 level joint standards.Standard, forward-and-backforward- ... type three series, a total of sleeve more than 50 varieties, and can ... rebar connection demand.