If you have a requirement for iron rods for whatever reasons including construction works then you will have to realize that it would be important to get those that are of the right size in order for you to achieve your goals without issues. If you pick the wrong size of iron rods then you would start delaying your project as things would simply not appear to be moving further.
There are countless resources online that could assist you learn all the tricks needed to identify and purchase the right sizes of iron rods which you should be going through and learning. You may also want to seek help from an expert when looking for jual besi hollow iron rods as they would be in a better position to determine which sizes would perfectly meet your requirements.
It is for this reason that the recommended way of proceeding in researching the marketplace for iron rods and ordering them accordingly would be by getting an expert who specializes in it to do it on your behalf. You could accompany them to follow things through too. So, make sure you always pick the right size of iron rods so you can have your projects accomplished quickly.