Drywall screws come with fine threads and coarse thread. The coarse threads are better for screwing operation. It goes in and out faster, it holds bettering soft materials, and it is less likely to cause wood to split. Normally these screws are very long and thin, and have a distinctive appearance. These screws are most often black in color. It is very hard and brittle, so the heads tend to break off if the amount of torque used in driving them is too great. These screws are made of especially hard steel because of their length and their thin nature. Some drywall screws have a twin set of threads rather than just one long continuous thread. These screws are sharp enough to insert directly into pine lumber.