Features and Benefits:

• Made of Cr-Mo alloy steel
• Sockets include a spring loaded magnet that retracts into the socket during extended bolt applications
• Set includes: 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm and 15 mm
• Packaged in a heavy duty blow mold case

This is an impact socket set. It has 14 pieces. It is 1/2 in. drive.