Package Includes: You will receive 4 pieces insulation puncture clips, sufficient to meet your daily needs and replacement, there are 2mm and 4mm sizes, you can choose different jack sizes according to your needs Material: The insulation puncture test tool is made of high-quality plastic material, which is firm, wear-resistant and not easy to break, and can provide long-term service for you Size: The size of insulation puncture tool is 9.7 x 2.2cm/3.81 x 0.86inches, small and light, easy to carry and store Usage: First turn the thread to unscrew the probe, adjust the spring clamp to make the probe clamp the wire to be tested, then insert the multimeter rod into the tail socket, and finally measure the voltage with the voltmeter Wide scope of application: Insulation puncture test tools can be used for equipment maintenance, electrical appliance maintenance and automobile maintenance, helping you to easily and efficiently complete the line test voltage test.Items from Sheng Xinshun's shop