1/4" to 1-1/2" (6mm-38mm) CUTTEX TOOLS Spade Drill Bit Set, 13 PCS The Most Common Sizes, Full Set Heavy Duty Paddle Flat Bits, Nylon Storage Pouch Included: Amazon.com: Tools & Home Improvement
1-1/2" x 4.5" Flat Boring Spade Bit | Milwaukee Tool
1 in. x 12 in. Long Spade Bit/Paddle Bit/Wood Bit (1 to 120 Bits) by X1 Tools Silver - Amazon.com
DIABLO 1-1/4 in. x 6 in. Demo Demon Spade Bit for Nail-Embedded Wood DSPD4070 - The Home Depot