A: The required length of the test specimen is 60cm. But you know, to make the qualified Rebar Mechanical Connection Specimens, there may be some rebar loss during the operation. So 70cm to 80cm would be better for technician’s operation. If you send us 60cm. We could also try to do it for you. but if any rebar loss during the operation, the rebar samples can not be used to make the test specimens.