This Proto wrench is a top-quality tool made in the United States. It features a 3/8" size and 12 point drive type, making it perfect for automotive and other mechanical work. The wrench is chrome-plated for durability and long-lasting use. The set or single item is sold as a single item, and the system of measurement is SAE. As a reminder, there is no warranty included with this purchase. This wrench is a must-have for any DIY mechanic or professional.