These stirrers are designed and engineered specifically to meet the continuous demands of heavy industrial use. The heart of the line is the high performance Brushless Direct Current (BDC) motor. A unique two speed transmission gives the digital lab stirrer incredible amounts of power. Mixer Direct stirrers are quiet, dependable, maintenance free and ideal for continuous use. Included in each purchase: Overhead stirrer motor, chuck, chuck guard, chuck key, support rod, power cord, and manual.