1, Wide working range: adaptable for 12mm- 50mm same diameter, different diameter, bending, new and old, advance covered up rebar of GB 1499, BS 4449, ASTM A615 or ASTM A706 standard. 2, High strength: stronger than the reinforcement bar and guarantees bar break under tensile stress(tensile strength of bar joint =1.1 times of bars specified tensile strength). It can satisfy the requirements stipulated in the Chinese standard JGJ107-2003, JG171-2005. 3, High efficiency: upset forging and threading one joint only needs no more than one minute, and handy operation and quick link. 4, Environmental protection and economy profit: no environment pollution, can work all day, not affected by weather, economize energy source and bar material