Feature: 1. Universal Application: The kit includes a red and black connector for connecting the positive cable to the earth cable. Thru panel battery connector is suitable for a variety of applications from car audio to marine. 2. Main Function: 3/8 inch nickel plated copper terminals allow you to properly secure cables as large as 4/0AWG to your firewall with sufficient torque to pass current to the other side. 3. Safe and Easy Use: Battery terminal, is used to easily connect power and ground, provides firm attachment points for installation. 4. Premium Material: Thru panel battery terminal connectors are made of high grade nickel plated copper materials to ensure stable performance and long durability. 5. Strictly Tested: Thru panel battery terminal has been extensively tested, safe and dependable, will last in the car for a long time. Specification: Item Type: Thru Panel Battery Terminal Connectors Material: Nickel plated copper Operating Voltage: DC 12V to 48V Rated Current: 440A Instantaneous Current: 550A Number: Pair (red positive + black negative) Cross Sectional Diameter of Terminal Post: 3/8 inch Terminal Post Length: 1 inch at both ends Diameter of Opening: Approx.32mm/ 1.3in Application: Nickel plated copper posts allow you to properly secure cables as large as 4/0AWG to your firewall with sufficient torque to pass current to the other side Fitment: For a wide range of applications from car audio to marine. Package List: 1 Pair x Thru Panel Battery Terminal Connectors Note: Professional installation is recommended