Aluminum oxide mounted grinding wheels with 1/4 In. arbor. Can be used on electric drills and die grinders with 1/4 In. chuck. Type: Size: 2" x 3/8" Shank Diameter: 1/4" Grit: Maximum Speed: LA VIE 12pcs Disc Polishing Wheel Wood Saw Blade Wire Wheel Abrasive Paper Electric Drill Angle Grinder Connecting Rod Cut Metal Neiko 10193A Titanium Step Drill Bit Set, High Speed Steel | 3-Piece Set | Total 28 Sizes is manufactured by. Neiko 10193A Titanium Step Drill Bit Set, High Speed Steel