The InSITE window is a 360° clear window which allows the installer to verify that the prepped cable has been inserted far enough into the connector to make contact with the fixed pin-before the connector is compressed. All IDEAL compression connectors require a 1/4" x 1/4" industry standard coax preparation. The prepped cable is then inserted into the connector until the folded braiding is visible within the InSITE window. No measuring, no jacket marking, no guesswork a confident connection every time.