It includes the most popular 13 SAE and metric sockets. It is made of CR-MO alloy steel for long life. It is fully guaranteed and includes a heavy duty blow molded storage case. 5/16 inch / 8mm included as one socket 3649 – 3/8 dr. Sae and metric Impact hex driver Set. All impact sockets are forged from the highest quality chrome molybdenum alloy steel for long life Packaged in compact blow molded case for durable, convenient storage and transport. All sockets Available individually.