Features 1. The puncture clip allows users to provide precise pressure required to puncture insulation layers of various types and sizes of wires. 2. The unique design is both economical and convenient, allowing for quick removal to expose the piercing head for necessary polishing, extending the product's lifespan, and eliminating the need to completely replace the test clip like other models on the market. 3. The red and black barrels can quickly identify circuits, and the bright yellow barrel is also easy to find in low light conditions. The "online fixation" function of the test clip provides more convenience. Once the test clip is connected to the lead, the test lead can be removed from the clip and tested at another location. 5. Usage: Connect it to the banana plug, then hook the other end onto the insulated wire, rotate the red or black end of the clip, and the sharp needle will pierce through the insulation layer and make contact with the wire. Specification Product specifications: Two pack Interface diameter: 2mm, 4mm Product length: 98mm Individual weight: 0.02kg, pair weight: 0.04kg Package Include: 1Pair Wire Piercing Puncture Probe Test Clip (2mm/4mm)