Switchcraft 299 1/4" TRS Audio Plug: Features: Switchcraft's 188 is more heavy-duty than our competitor's biggest 1/4" commercial phone plugs. Large curved tip solder terminal makes it easier to solder to heavy gauge wires. Longer sleeve terminal allows more room to make sleeve solder connections. Extra-large cable clamp securely grips cable of up to .450" in diameter. Will easily accommodate some varieties of four conductor 14 gauge wire and parallel two conductor 12 gauge wire.