Hardware House 51520 6 Piece Wood Spade Drill Bit Set - 3/8-Inch to 1-Inch Size Assortment - 6" Long with 1/4" Hex Shank to fit any drill - - Amazon .com
Vermont American 14462 - 3/4-Inch Self Feed Spade Bit - - Amazon.com
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: Industrial & Scientific
Amazon.com: IRWIN SPEEDBOR Spade Wood Drill Bit 1-1/2" X 4" (87924): Home Improvement
Spade Bit, 11/16 In D, 6 In L, I/4 Shank - - Amazon.com