Upgrade Design - Copper plates are held in place by large bolts instead of small screws, bus bar and base can withstand large torque, the entire busbar more stable and the busbar will not shake when unscrewing the nut. The small screw is centered, the wiring is more convenient to pass from the side, the wiring can also be staggered from other high-current wires. Specification - 12-48V red & black bus bar with screw: 3 x #8() terminal screws, 4 x 3/8Inch (M10) terminal stud. The dimensions(LxWxH): 17x7x5cm. Weight: 0.563kg. All the terminals of our bus bars are made of stainless steel, which will be less prone to rust compared to other Iron terminal busbar and can be used for a longer time. Heavy Duty - Power distribution block Max 300V AC or 48V . The 4.0 mm copper bar is thicker than others 2.0 mm brass busbar, and the 5mm copper plate is thicker than the other 3.0mm copper plate and can withstand higher currents. Superior Quality - Nickle plated brass busbar plates offer low resistance, maximum conductivity, and protection, stability and the oxidation resistance, extend the service life. The nylon nuts connect to two external studs, removable Nylon busbar cover can cover exposed areas to prevent accidental short circuits. The insulated nylon base is flame-retardant, Superior Insulation & Strength. Wide Application - Bus bar is excellent for managing wires and distributing power, have plenty of connection points for both positive and negative wiring terminals, keep the circuit neat and orderly, make your wires doesn't a rat's nest under the hood anymore, reducing the possibility of short circuits. Suitable for cars, trucks, solar, caravans, ships and yachts, etc. Colour:As Shown Material:Plastic Package Contents: 2 * Terminal 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.