Features and Benefits:

• CR-MO alloy steel for long life
• Sizes include: 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm and 15 mm
• Great for use in confined spaces
• Provides increased strength, but also avoids rounding of rusted or damaged fasteners
• Heavy duty blow molded storage case included

This is an impact socket set. It has 11 pieces. They are 1/4 in. drive and 12 point. Design makes sockets strong and durable.