Most things that you would want to look into these days have been standardized and optimized in order to make them more effective in a wide range of ways. You can change these standardized processes but you should bear in mind that the standard options are there to make your life easier so you might want to take them into consideration even if you don’t plan on using them.
This applies to metal business cards just as much as it does to anything else at the end of the day. The standard size for a business card is usually 3.5 inches by 2 inches, with the text generally being arrayed horizontally. That means that your business card would likely be seen and read by someone that would tilt it on its side, rather than vertically. You might assume that this would limit your options due to the reason that you may have been interested in changing up the sizes, but try to remember that these dimensions are just one aspect of your overall design.
If you don’t want your business card to seem like just another drop in the bucket, you can arrange it vertically instead of horizontally too. That might even be a bit more logical since it would take into account the natural way in which you would be handing these cards over to others. However, try to keep the card’s dimensions in line with what we have told you above since they tend to work out best in several different kinds of ways.