Yellow butted-seam, vinyl-insulated barrel fits snugly to ensure quality performance in your installationsPolyvinyl chloride sleeve with funnel design makes wire insertion easy with this butt connectorHas a built-in wire stop to promote correct wire positioningWire sizes ranging from 12 to 10 AWG fit into this connectorThe electrolytic copper construction ensures strong conductivity, and the tin plating resists corrosion for long-lasting function