The MAC Tools set includes 12 sockets and one SK ratchet driver, totaling 13 pieces. The sockets are standard size and come in a range of measurements from 6/16 to 13/16 inches, as well as 19mm and 31/32 inches. The set is designed for 1/2 inch drive size and includes both SAE and metric measurements. Made in the United States, this set is a valuable addition to any toolbox, providing a variety of sizes and styles for different automotive and industrial applications.