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This Calrad 72-172 RJ45 terminal block adapter is a convenient solder-less adapter used to connect RJ45 connectors to devices with different types of signals over inexpensive UTP Cat5e, Cat6 cable without the use of RJ45 connectors or crimping tools. The Calrad 72-172 terminal block adapter has labeled terminal blocks 1-8 positions and accepts 22 to 24 AWG wire.