Features and Benefits:

• Magnetized to hold fasteners securely during installation and removal
• Set includes: 3/16 in., 7/32 in., 1/4 in., 9/32 in., 5/16 in., 11/32 in., 3/8 in., 7/16 in.,1/2 in., 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm and 15 mm, 1/4 in. Dr. universal joint and a 1/4 in. Dr. 2 in. extension
• Chrome-molybdenum alloy steel for long life
• Magnetic sockets hold fastener securely in place
• Comes in a heavy duty blow molded case

This is an impact socket set. It has 23 pieces. It is 1/4 in. drive. Design makes sockets strong and durable.