Features 1、Easy to Use: It can be replaced quickly and does not require wiring , which is sturdy and durable, ensuring long term use 2、Good Contact Force: The required contact forces are ensured even after hundreds of thousands of laps 3、Needs to Be Used Together: Needles are mainly used to connect and can be used together with all kinds of needles 4、Accurate Test: As far as possible, the contact resistance between the test probe and the test point is small to ensure the authenticity of the test results 5、Purpose: The needle is mainly used for connection and can be used with all kinds of needles. Used for electronic parameter testing, electronic component testing Specification Item Type: Metal Spring Test Probe Sleeve Model: R156-4 S Material: Red Copper Application: Electronic Parameter Test, Electronic Component Test, Electronic Product Information Lead, Etc Basic Parameters: Sleeve Diameter: Approx. 2.89mm / 0.1in Total Length: Approx. 30mm / 1.2in Pipe Mouth to Raised Rings Position: Approx. 7.5mm / 0.3in Needle Sleeve Drilling Size: Approx. 2.75mm / 0.11in Package List 100 x Metal Spring Test Probe Sleeve