This BNC connector coupler provides a commercial grade installation 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 fits standard wall plate, panel or surface box; Compatible with nearly all style wall plates. TWIST-ON FEATURE - When installing the cables behind the wall, make to aim the raised the connector, insert the BNC cable to the connector, and twist of cable so the connector is locked securely to your BNC cable behind the wall. WIDE COMPATIBILITY - Reusable design for disconnect and relocate when upgrading or redecorating, allows to fit most standard wall plates, surface mount box or panel. Material:Zinc alloy + plastic colour:Photo Color Package Contents: 10 * BNC Only the above package content, other products are not included. Note: Light 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.