Diablo DSP2920-S6+2 6+2 pc SPEEDemon™ Spade Bit Set (6+2-Piece) - Amazon.com
GMTOOLS 13 Piece Spade Drill Bit Sets, Paddle Flat Bit for Hole Cutter Woodworking, 1/4" to 1-1/2", Carbon Steel Paddle Flat Bit with Quick Change Shank, Nylon Storage Pouch Included - Amazon.com
Disston 1 1/2" Threaded Spade Bit 10X Faster than standard spade bit, 6" long, E0102691
DIABLO 6-Piece SPEEDemon High Speed Steel Spade Bit Set with 2-Bonus Bits (8-Piece) DSP2920-S6+2 - The Home Depot
Diablo - DSP2110-P2 7/8 in. x 6 in. SPEEDemon Spade Bit (2-Pack) - Amazon.com
1-1/2 in. x 6 in. Long Spade Bit / Paddle Bit / Wood Bit (1 to 120 Bits) | eBay
Irwin 87924 1-1/2" x 4" Speedbor Spade Bit
1/2" Spade Drill Bit
Irwin Speedbor 1-1/2 In. x 6 In. Spade Bit - Anderson Lumber