Features: Puncture clips allows the user to provides the accurate pressure required to puncture the insulation of various wire types and sizes. Both cost-effective and convenient, it can be quickly removed to expose the puncture nib for any required sharpening, extending the using time of the product and eliminating the need to completely replace the test clip. The red and black color-coded ends provides quick circuit identification and the bright yellow body is easy to locate in low light conditions. The test clip offers further convenience with its 'in-line retention' feature. Once the test clips are attached to the leads, the test leads can be removed from the clips for testing in another location. Use: attach it to the banana plug and then the other end can be hooked onto the insulated wire, by turning the red or black end of the clip the nib pierces the insulation to make contact with the conductor. Specifications: Connector: 2mm, 4mm (optional) Main color: yellow Main material: plastics Item length: 98mm / 3.9in Package size: 100 * 50 * 30mm / 3.9 * 2.0 * 1.2in Package weight: 45g / 1.6ounce Packing List: 2 * Wire Pricker