Drum type concrete mixers are important part of the concrete mixers available today. They are most suited for small to large capacity machines. As the name suggests, the mixer is drum type with an opening in one end or in some cases two ends. The material used to make concrete (aggregates, sand, cement, water) are mixed inside the drum as the drum rotates. But it is not as simple as it seems there are designed flights inside the drum that help in mixing and unloading the contents.