Amazon.com: BOSCH CO2143 1-Piece 1/4 In. x 4 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
14pc Titanium Coated Hex Shank Drill Bit Set - Montana Brand Tools – Made in USA
Amazon.com: IRWIN Drill And Tap Set, 1/4-Inch - 20 NC Tap and 13/64-Inch Drill Bit (80230) : Industrial & Scientific