WORKPRO 10-Piece Pro Spade Drill Bit Set- Black Coating, Premium Carbon Steel, Paddle Flat Bits for Woodworking, Assorted Bits 1/4" to 1-1/2" with Storage Case - Amazon.com
Milwaukee High Speed Wood Spade Bit Set (26-Piece) 48-27-1520-48-27-1520 - The Home Depot