4x USB 3.0 A Female/F Snap-in Coupler Jack Insert for Keystone Wall Plate,A Female/F Snap-in Coupler Jack Insert for Keystone Wall Plate 4x USB 3.0, For use with Keystone panels or wall plates,USB style Keystone Jack- Coupler type (female connectors on the front and back).Keystone Wall Plate 4x USB 3.0 A Female/F Snap-in Coupler Jack Insert for.