Cobtel RJ45 keystone jack designed for use with a wall-plate for network connection. Simply insert the leads in the coloring order you wish and clamp them down. Category 5e Keystone Jacks are 8-Position 8-Conductor (8P8C) and use the same 110 Punch Down style that most patch panels use.The main benefit for keystone couplers is that patch cables can be plugged directly into both sides and requires no rear termination.
link:https://www.cobtel.com/keystone-jack/cat5e-keystone-jack/rj45-ethernet-jack.html