The Milwaukee Steel Screw Extractor Set includes 4 pieces with the manufacturer part number 49-57-9001. These screw extractors are designed for electrical drive applications and are manufactured in China. As a set, this product is a valuable addition to any automotive tool collection, offering the necessary tools for removing stubborn screws with ease. With the trusted brand of Milwaukee, you can be confident in the quality and reliability of this screw extractor set for various automotive and industrial applications.