A keystone module is a standardized snap-in package for mounting a variety of low-voltage electrical jacks or optical connectors into a keystone wall plate, face plate, surface-mount box, or a patch panel. Keystone modules have a rectangular face of 14.5 mm wide by 16.0 mm high and are held in place with flexible tabs. This allows them to be snapped into a mounting plate with correspondingly-sized rectangular holes, called ports.This USB keystone, a pass-through type connector, is interchangeable, replaceable and provides much flexibility in arranging and mounting many different types of electrical jacks in wall plate or outlet panel without requiring customized manufacturing.
from Consumer Electronics Store http://cestore.net/accessories-supplies/audio-video-accessories/cables-interconnects/video-cables/f-pin-coaxial-tip/TNP-Keystone-Coupler-Connector-Adapter.html?pid=B01GCIK4AO
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