Extreme-Performance 1/4" Drill Bit for CNC Routers, 1/4" Shank – IDC Woodcraft
12 PCS,1/4", HSS Black and Gold Coated Twist Drill Bits, Metal Drill, Ideal for Drilling on mild Steel, Copper, Aluminum, Zinc Alloy etc. Pack in Plastic Bag - Amazon.com
IRWIN 4935643 - 12-Piece Black Oxide HSS 1/4" Hex Shank Fractional Drill Bit Set - Walmart.com
Precision Twist Drill 034416 | 1/4" Diameter 4" OAL 118 Degree High Speed Steel Bright Finish Jobber Length Drill Bit - All Industrial Tool Supply