OCI Metal Insert, for GC-2010 OCI/PTV type injection port only in OCI mode (On Column Injection), for injection on to 0.53mm ID column only, each. Also described as OCI-2010 metal column guide. The metal insert for use in true OCI mode (true on-column injections). Please see part number 221-49381-02 for glass liner used to perform Simple On-Column (also called Near On-Column) injection technique.