POLYPROPYLENE BRUSH - Stiff poly bristles clean coal and soot from metal stove pipes, flue, and chimneys GALVANIZED STEEL STEM - Heavy duty double-spiral stem for long-lasting durability 1/4 INCH NPSM FITTINGS - Features 1/4" male pipe threads for use with our fiberglass rod kits (sold separately) PROFESSIONAL QUALITY - Superior components provide excellent performance MADE IN USA - Quality manufactured in the Midwest!