This BNC connector keystone coupler provides a commercial grade installation for home theater, CCTV security surveillance camera or high-end video applications. COUPLER TYPE - Provides a sturdy Female to Female in-line BNC connector. QUICK SNAP - Quick snaps in installation and easily fits standard keystone wall plate, patch panel or surface box; Compatible with nearly all keystone style wall plates. TWIST-ON FEATURE - When installing the cables behind the wall, make sure to aim the raised spot on the connector, insert the BNC cable to the connector, and twist the end of cable so the connector is locked securely to your BNC cable behind the wall. WIDE COMPATIBILITY - Reusable keystone jack design for easily disconnect and relocate when upgrading or redecorating, allows to fit most standard keystone wall plates, surface mount box or patch panel. Material:Zinc alloy + plastic colour:Photo Color Package Contents: 5 * BNC Keystone Jack Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.