This Sunex 3/8 inch drive 14 piece metric mid-depth impact socket set includes the most common sizes used for automotive repair. It is made of CR-MO alloy steel for long life. It is fully guaranteed and includes a heavy duty blow molded storage case. Sizes include: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm and 22mm. For those applications when you need a little more reach than standard depth impact sockets can provide, in a confined space that prohibits fastener access to deep impact sockets.