Some towel bars come with all the screws and the screw anchors that you will need to install the bar, but they might lack quality. So, I advise you to inspect them properly before you use them. If you are not satisfied with the quality, get the screws and the screw anchors from a home improvement store. You should be careful while drilling, wear protective eye gear. When you are drilling ceramic tiles, see that you do not damage the tiles, it is better that you drill on the grout line.