Block Adaptation : 1 x 0 Gauge In, 2 x 0 Gauge Out. Package Including: 1Pc Blocks, 2Pcs Screws and 1Pc 3/16" Slotted Allen Hex. Car Audio Amp Power /Ground Distribution Block, offers complete protection for your car audio system. It makes wiring your system more easily with high quality distribution blocks. The 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. Allen head tops and oversized set screws with small serrated ends guarantee a strong consistent connection that guards against loose wires. Kirsite plated internal materials eliminates the possibility of Corrosion, Rust, Oxidation, or premature wear on speaker wire connection points. Screw-down wire clamps, impact resistant snap-on plastic cover, solid construction for corrosion resistance, ensures your system works perfect as expect.