GadKo Blank Surface Mount Box for Keystones, 1 Hole, White GadKo is the only authorized dealer of GadKo branded products. This white surface mount box is designed to house 1 keystone of any type. Keystones come in many different varieties; from network jacks to HDMI couplers; BNC couplers and beyond. Networking; Home Theater and security/surveillance is all covered by this simple to install and highly dynamic surface mount box. Now your installation can a professional appearance and structure.