In order to minimize transfer waste and save capital investment, many manufacturers choose to do their mixing right in the drum where they receive their product. In order to do that appropriately Mixer Direct has developed a line of drum agitators that attach in a variety of ways to the 55 gallon drum. Some clamp on to the side or a stand placed next to the drum. Others prefer to replace the lid on an open top drum with a Drum Lid Mount drum mixer. For closed drums, the bung mount mixer has folding impellers that open up when the motor is activated.