Woodworking Forstner Drill Bit Sets, Knugoua Carbide Tungsten Steel Boring Bits Wood Hole Saw Kits Cutter Auger Opener Drilling Bit Tool Big Size 3/5~2-1/11 Inch Set of 14 - Amazon.com
Forstner Bits for Smooth, Flat-Bottomed Holes in Wood
Step Drill Bit,Knoweasy 3Pcs High-Speed Steel Step Drill Set,4-12mm/4-20mm/4-32mm Drill Bits Set,Used for Drilling Plate Aluminum Metal Wood Hole, Large Hole Drill Suitable for DIY Lovers - Walmart.com
Chiloskit 4-52mm HSS Large Unibit Step Drill Bit for Metal Hole Cuter Wood Drill Bit Set - Amazon.com
1 in. - 2-1/2 in. Carbon Steel Hole Saw Set, 10 Pc.
Best bits for Big Holes
USA 5Pcs Large Metal Step Drill Bit Set HSS Multiple Hole 50 Sizes w/ Case | eBay