Easy to use coupler style keystones allow you to use RJ45 terminated cables in the front and the back eliminating the need to splice wires while standing behind a rack. You can use pre-terminated fix length cables as well, eliminating the need for crimping. Fits all standard keystone wall plates and panels.Easy to use coupler style keystones allow you to use RJ45 terminated cables in the front and the back eliminating the need to splice wires while standing behind a rack. You can use pre-terminated fix length cables as well, eliminating the need for crimping. Fits all standard keystone wall plates and panels.