The Performance Tool W1338 9-Piece External Star Socket Set is a must-have for any mechanic or DIY enthusiast looking for durability and ease of use. Made from Heat-Treated Alloy Steel and polished with a Chrome Plated Finish, this set resists corrosion and rust, ensuring long-lasting use. The set includes 1/4" Dr. sizes (E-5, E-6, E-7 & E-8) and 3/8" Dr. sizes (E-10, E-12, E-14 & E-16), making it versatile for various automotive applications. With a bonus Storage Rail for easy organization and accessibility and a 3/8" Female to 1/4" Male Adapter, this set is compatible with both 1/4" and 3/8" drive ratchets and extensions. The External Star Socket design ensures a precision fit for fasteners, reducing the risk of slipping or stripping, making this set a reliable choice for any mechanic or DIY enthusiast.