High-performance BKR6EQUP 4-pin copper spark plug with precision-engineered short thread design. Premium copper core ensures superior conductivity and faster heat dissipation for optimal combustion efficiency. Durable nickel-plated shell resists corrosion and extends lifespan. Compact short-thread construction fits most modern compact engines while maintaining easy installation. Ideal for high-mileage vehicles, turbocharged engines, and performance tuning applications. OEM-compatible replacement part with exact factory specifications. Batch-tested for consistent spark intensity and reliable cold starts. Cost-effective bulk solution for auto workshops and fleet maintenance. Ships in protective individual packaging to prevent electrode damage.