upply construction material threaded coupler .1.material: carbon steel 2.specification:Can be used to joint rebars with diameter 12mm to 40mm3.There is straight thread inside the adapter sleeve.4.High intension of tie-in and 100% exerted grade reinforcing steel bar connectiontechnology guideline. 5.Power adaptability which may full meet varies part reinforcing steel bar technologyinquires.6.It is not limited of climate and all day construct insure time limit for a project.7.For function, stability quality and quality testing in measure and eyeballing thatcontrol quality at any time. 8.When connection only use cannulation and spanner don't use any energy source andequipment and safety construct.9.No pollution construct that is benefit for civilization. 10.Economize energy source and material and economy profit and society benefit salience.11.It is benefited construct.