Connection model: The test probe is suitable for testing lead with a standard 4 mm banana plug. It can be used with most test lead kits, diagnostic equipment, and automotive testing and maintenance on site. This test probe is convenient for checking the circuit and piercing the wire insulation, and is a tool for back-probing the electrical measurement of automobiles. About 93 mm long Wide range of applications: Test probe applications include automotive, industrial, HVAC, electrical, marine, etc. which can be perfectly matched with many multimeter connectors. Material:PVC+Stainless Steel colour:As shown Package Contents: 4 * red Insulation puncture needle 4 * black Insulation puncture needle Only the above package content, other products are not included. Note: Light 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 +/- 1-3cm.