Fluke TP81 Insulation Piercing Probes with Banana Jack. Stainless steel probe pierces insulation on 14, 16 and 18 gauge wire. You control needle depth to minimize insulation damage. Essential for use under hood or under dash. Use it on fuel injectors or sensors while providing complete insulation to grounding due to design. The TP81 connects to banana jack leads (such as Fluke's TL224). Mfg. part Fluke 2149098. Fluke parts and accessories.