Amazon.com: BOSCH CO2150 1-Piece 23/64 In. x 4-7/8 In. Cobalt Metal Drill Bit for Drilling Applications in Light-Gauge Metal, High-Carbon Steel, Aluminum and Ally Steel, Cast Iron, Stainless Steel, Titanium : Industrial
Drill America 1-23/64 in. High Speed Steel Black Oxide Reduced Shank Drill Bit with 1/2 in. Shank DWDRSD1-23/64 - The Home Depot
Irwin TURBOMAX 23/64" Heavy Duty Drill Bit # 73323 | eBay