Maximum rated current busbar (500A), with M8 (5/16 inch) x 4+M10 (3/8 inch) x 2 binding posts Modular box design for easy wiring configuration, in addition, this power bus junction box can be used with MAX 48V DC and 300V AC. The red positive bus bar is paired with the black negative (ground) bus bar. 3/8 inch&5/16 inch Studs - Distribution block busbars feature 2 x 3/8 inch (M10) and 4 x 5/16 inch (M8) studs, allowing the 12V terminal block to accept 4/0 measurements Wires and terminals. Terminal size can be selected for more convenience. Waterproof - The 500Amp junction box is equipped with a waterproof ring, which can function as a seal, making your wiring safer and more reliable. This set of red and black busbars also comes with removable plates, which make it very easy for wires and terminals to pass through and prevent short circuits.<br><br>Material: plastic + metal Color as shown WIDE APPLICATIONS - 500A heavy-duty busbars make circuit wiring neat and prevent electrical short circuits, suitable for cars, cars, trucks, ships, marine, RV, solar and more.<br><br>Package Contents: 2 x Junction Box<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.