Thin and hard stainless steel needle: The needle is designed to be extremely thin and hard, allowing it to easily pierce the cable sheath without splitting it. Wide range of applications: This test extension back piercing needle tip probe kit can be used for auto maintenance, telecom testing, construction site testing, and other cable nondestructive testing. Antibreakage soft handles and copper needles: Equipped with antibreakage soft handles and copper needles, the test probes in this kit are sensitive and easier to manipulate during testing. The materials used ensure durability. Compatible with banana plugs and post ties: Designed to be compatible with banana plugs and post ties, providing convenience and versatility for multimeter use. Practical use scenarios: Auto maintenance: probe concealed wiring behind harnesses and verify circuit integrity without damaging insulation. Telecom testing: access and test telecom cables and patch panels without cutting or tearing cables. Construction site testing: inspect installed cables for continuity and integrity in nondestructive fashion.