Use To Extract Dust When Working On Most Bosch SDS-MAX And Spline Hammer DrillsFits All SDS-MAX And Spline Combination Rotary And Demolition Hammers With The Exception Of The 11316EVS And DH1020VC HammersDust Collection Shroud Focuses Air Suction From The Vacuum Around The Chisel For Maximum Efficiency Ski-Boot Style Clamping Band Provides Easy Installation And Adjustment Onto The Hammer TubeAdjustable Metal Extension Arm For Proper Positioning And Accommodation Of Different Chisel LengthsRubber Bumper Provides Cushion On Shroud Tip If It Contacts Workpiece During Chiseling ApplicationsDust Port Can Be Hooked Up To 1-3/8" Vacuum Hose Nozzle Or 1-1/4" And 2" Nozzles When Combined With An Appropriate Adapter (Not Included)