Wheel Diameter: 4-1/2" - 5"Material: Steel, PlasticFits All Bosch AG40, AG50, GWS And 1800 Series 4-1/2" And 5" Angle GrindersDust Collection Reduces Clean-Up Time And Provides Cleaner, Safer Air For UserLarge, Durable Foot Plate Greatly Increases Stability During Use For Clean And Accurate CutsSingle Screw Depth Adjustment Quickly Adjusts And Maintains Desired Depth Of CutCompletely Tool Free Design For Ease Of UseBosch AIRSWEEP Vacuum Compatible, Plug And Play Without Using Any Adapters