1 x 0GA IN, 3 x 4GA OUT: Input accepts 1/0 or 4 gauge wire, Outputs accepts 4 or 8 gauge wire, Come with 2 Pieces car amplifier power distribution, make wiring your system easier with high quality distribution blocks. 3-Way Connection: perfect for multi car amp systems, nickle plated internal materials eliminates the possibility of corrosion, rust, oxidation, or premature wear on speaker wire connection points. Deep Wire Recesses: distribution blocks with deep recesses to protect wiring from being left exposed to the elements or other objects that might cause your system to malfuction. Screw-down Wire Clamps: Hex head tops and oversized set screws with small serrated ends a strong consistent connection that instils confince against loose wires. Easy to Install: Screw-down wire clamps, impact resistant snap-on plastic cover, solid brass construction for corrosion resistance, ensures you get the out of your system that you expect. Colour: black Material: plastic + zinc alloy Package Contents: 2 * 3 Way Power Distribution Block Only the above package content, other products are not included. Note: Light 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.