The metal laptop briefcases are becoming as popular as the envelope fabric. It is popular because of the durability and safety it offers to users. It features a tough aluminum shell. The hull will not be upset if he is hit repeatedly. If you drop the case on several occasions, the defects of damage will not appear.The lock combination of three digits contains three dials. You must turn the dials until they are aligned with the numbers right. If the line does not line up at the right number, you will not be able to open the case. The password numbers can be changed from time to time. There is an instruction manual that provides instructions on how to define the numeric password. You must follow the instructions to configure the password for the number of the lock combination of three digits. You must change the password regularly so that your laptop will be secure at all times. Some cases of metals are not the lock combination of three digits.