Cat5E Punch Down Keystone Jack - Blue. CAT5E Punch Down Keystone Jack are designed to provide excellent performance which exceeds the industry standard TIA/EIA 568-B/A standard making these jacks perfect for use in today's high speed networks while remaining completely backwards compatible with all previous standards. Cat5E keystone jack. Meets or exceeds industry standard Category 6/Class E according to TIA/EIA 568B/A 2.1 and ISO 11801 2nd edition. Balances signal transmission of insertion loss and crosstalk. One plastic strain relief cap for IDC connector. Color: Blue. To be used with keystone wall plate or panel.