rebar coupler 1 material: # 45 high quality carbon structural steel 2 specification: 14-40mm 3 use: apply to HRB335 HRB400 RRB400 reinforced the connection 4 types: standard type left-handed and right-handed type reducing type rebar coupler 5 Our product has passed through authentication of ISO9001 quality system 6 Our products have the test report of national center for quality supervision and test of building engineering 7 Customer' s special demand is available Our coupler has passed official test in many countries, including India, Vietnam, Russian, Saudi Arabia and China, and the coupler has used in many key projects, such as â Fuqing Neclear Power Plantâ â Russina over-sea bridge for APEC 2012â â Sri Lanka National Art Theatreâ and so on.