1/2" self-fixed connector / joints, designed accord to the conduit lock, equipped easily 1/2" SELF-FIXED CONNECTOR / JOINTS Thread SpecificationBS, Metric, PGMaterialA, C ... zinc alloy, beautiful appearance, compact structure, high intensity.2. Designed strictly accord to the conduit lock, equipped easily ... thread specification accord to your special need. 1/2" SELF-FIXED CONNECTOR / JOINTS