500 pin kit with mixed sizes (1mm, 5mm, 1.8mm, 2.2mm, 2.8mm, 3.5mm) provides multiple options for 12V electrical connections. It is suitable for the main body wiring and is compatible with vehicle devices such as car radios, navigation systems, and car lights. Removal tools: 18 terminal removal tools included to easily remove and replace connectors. Insertion and removal of the plug and bus bar are designed with high precision, ensuring smooth alignment and faster installation and maintenance. Connection: terminal pins are made of copper and nylon, offering excellent conductivity and elasticity for a stable, durable connection. Optimized contact surfaces promote reliable power transmission and reduce electrical interference. Application: suitable for various 12V plugs and compatible with motorcycles, trucks, boats, jet skis, scooters, and cars. Withstanding multiple plug-in and pull operations, it delivers a long plug-in life for ongoing maintenance and repairs in automotive environments. Use scenarios: - Replacing or upgrading connectors in car radio, navigation, or lighting circuits. - Servicing 12V wiring in motorcycles or scooters where quick pin access is needed. - Maintenance and repair on trucks, boats, or jet skis that use 12V electrical systems.