Insulation Wire Piercing Puncture Probe Test Hook Clip Car Line Inspection Probe with 2mm/4mm Socket Auto Repair tool Features: Design: Unique design, can be quickly removed to expose the puncture tip for any required sharpening. The product has a long service life and does not require a complete replacement of the test clips like other models. For Various Wire Types: Allows the user to pierce the precise pressure required to pierce insulation for various wire types and sizes. Quick Identification: The red and black colors provide fast circuit identification, and the bright yellow body is easy to locate in low light conditions. Easy To Use: The test clip provides further convenience with its Online Hold feature. Once the test clips are attached to the leads, the test leads can be removed from the clips for testing in another location. How To Use: Connect it to the plug, then the other end can be hooked on the insulation wire, by turning the red or black end of the clip, the sharp needle pierces the insulation layer to make contact with the conductor. (with fairly minimal damage) What You Get: 1pc Car Line Inspection Probe (optional) Specifications: Item Name: Car Line Inspection Probe Material: Metal + plastic Color: As shown Jack Size: 2mm/4mm (you can choose the tail jack size according to your own needs). Item Size: 96mm*19.3mm/3.77in*0.75in Item Single Weight : Approx.20g/0.70oz Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 10-30mm.