Chuck Size: 3/8"Ideal For Angled Drilling, Doweling, Plug Cutting and Edge SandingAttaches To Any 3/8" Or 1/2" Power DrillProtractor Allows Adjustment Of The Drill's Vertical Angle From -45 Degrees To +45 Degrees in 5 Degree IncrementsV-Guides On The Base Automatically Centers Dowels And Other Rounded StockPositive Stop For Accurate Drill Depth ControlDual Locking Knob And Handle Hold Exact SettingsSelf-Centering Channel For Edge DrillingFolds Flat For Storage