Features: 1.Bus bar with the highest rated amperage (300A) with M8 terminal studs (also available in M10). 2.The glass fiber reinforced nylon base and shell ensure excellent mechanical strength and durability. 3.The blank writing space at the top makes it easy to mark each branch. 4 studs (5/16in), movable window, unblocked wiring. 4.The heavy?duty modular box design is convenient for wiring configuration. 5.Comes with 4pcs mounting screw, which provide much convenience for your using. Specification: Item Type: Bus Bar Power Distribution Box Material: Plastic+Metal+Nylon Size: Approx. 13.9x7cm/5.5x2.8in Overview: The Bus-Bar Box plays a role of accommodating a negative wire harness in a car or a ship yacht, and brings the wires of the negative electrode together to make the box storage more beautiful. Bus Material: Brass, Nickel plated Base And Cover Material: Nylon, Glass Fiber reinforced Maximum Operating Voltage: DC 48V Maximum Amp Per Circuit: Determined by wires connected Terminal Stud Size: 4 x M8 (5/16in) PackageList: 1 x Power Distribution Box 4 x Mounting Screw