SUPMX-71938-CL Closed Stand w/ built in casters is the newest member of SuperMax Tools drum sander family which was designed with new features to improve productivity. Patented Quick Adjustment Lever: reduces set-up time. Built-in DRO (digital read out): maintain material thicknesses to increase accuracy and quality. Turbo Vented dust port: increases airflow to your dust collector by 15%. Rear placement of the Gear Motor: improve conveyor belt tracking. These new features complement the same great features SuperMax Tools have provided for years. Patented Fast Lever: allows quick adjustments for wide and narrow stock INTELLISAND Technology: prevents gouging, damaging, or burning material.