Features: Modular box designs, easy wiring configuration. The glass fiber reinforced nylon base and cover ensure high mechanical strength and durability. Detachable for barrier-free wiring, which reasonably accommodates the cables inside the vehicle and ship. Actual Use: The middle M8 connected to the negative rod of the device, and the M8 at both ends connected to the negative rod of the battery; a small current collected from each device, such as 3A, 5A, 10A, 8A,etc. Integrate a thick line to collect a large current in the range of 300A To the battery. Good Function: Plays a role of storage of a negative wire harness in automobiles, ships and yachts. The negative wires are gathered together to make the box storage more beautiful. Specifications: Material:Metal Stud:M6(1/4"), M8(5/16") Color:Red,Black Voltage: 48V Connection amplifier: 300A Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1Set Power Distribution Block