Protect Cover & Nuts: Each power busbar come with a protect cover and nuts, which helps to shelter as much exposed area as possible to reduce the risks of accidental contact and prevent short circuit, makes the circuit . and Safe: The base of the battery terminal block is made of pc, the nuts and screws are made of stainless steel, and the gasket is made of copper, stable in structure. Each bus bar includes a cover to protect connections from protect against damage and . Easy to Install: you just need to use the screws to fix the battery terminal distribution block in their respective positions, then use wiring on the screw, tighten the nut to fix, easy to operate without complicated installation steps. Wide Application: This 4 post busbar is an excellent circuit collection wire Harness in the car, RV, yacht, caravan, and ship power system. Maximum amplifier per circuit: determined by the connected wires. Maximum working voltage is DC 48V & up to 300 Amps. Product Type:BusBar Max Voltage:300V AC, 48V DC Terminal Studs:4 x M8 (5/16Inch) Distance between Screw center:145mm Mounting Diameter:6mm Suitable:Suitable for automotive, car, marine, boat, Solar power line renovation,etc. Colour:Black & Red Material:PC+Copper+Stainless Steel Package Contents: 1 Distribution Block Kit 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.