Insulated terminal blocks have nylon 66 housing to ensure "touch proof" safety. Recessed screws and tubular contacts provide additional safety and help prevent short circuits. Integrated stainless steel spring wire protectors prevent twisting and breaking of stranded wires during installation. Tubular contacts connect stripped solid or stranded un-terminated wire directly to each contact. Modular design allows for connector to be cut into smaller sections or stacked end-to-end.