- Compatibility and fit: Confirms precise size for a perfect fit; accommodates a wide range of auto models with 14 mm and 16 mm spark plug socket sizes for versatile use. - Material and durability: Made from high quality alloy steel with a precise heat treatment process, providing good hardness and durability for reliable performance. - Improved grip and ease of use: Unique design with enhanced texture increases grip and friction, enabling easy removal of spark plugs even in tight spaces. - Magnetic retention: Strong built in magnet keeps spark plugs securely in place during installation or removal, preventing drops and saving time. - Use in a typical engine bay to service a 4 cylinder car with 14 mm plugs. - Use in a compact SUV with 16 mm plugs where space is limited. - Use in a workshop for repeated plug changes in tight engine compartments.