C&E Blank Surface Mount Box for Keystones, 4 Hole, White (CNE43705) This white surface mount box is designed to house up to 4 keystones of any type Keystones come in many different varieties, from network jacks to HDMI couplers, BNC couplers and beyond Prune able design: prune the pillar height to suit keystone base if necessary Networking, home theater and security/surveillance is all covered by this simple to install and highly Dynamic surface mount box Operation Temperature:-40 degree C +70 degree C