"Single-row" refers to the orientation of IDC connectors on the rear of an Ethernet keystone jack. Single-row jacks are popular among technicians because they are quite easy to terminate, but also keep in mind that they have a wider rear profile. ShowMeCables.com sells both ShowMeCables and ICC brands of ICC jacks in a wide variety of colors. Keystone jacks will work with any keystone patch panel, wall plate, or surface-mount box.
White Single Row Cat5e Keystone Jack 15-155WH on ShowMeCables.com:
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