The technology of this connection is when connecting two pieces of concrete, or connecting the horizontal and
vertical columns pre-embedded in the wall column, the actual length is different when in connection, and need to adjust the different length.

First screw the standard thread length coupler onto a thread bar (on the rebar for fixing the concrete), then screw another extended length coupler onto another bar(on the rebar which wait to be fixed to the concrete).

Please note that the strength of the connected thread rod is grade12.9. The thread on the thread rod and coupler can be

adjust different lengths and adjust with the length of the rebars which wait to be connected. For example, the
connection of 25 size rebar can be adjusted by about 3-5CM. If the length is different, our company can customize
the length of the thread rod and control it according to the on site length range.