M8 Drill Bit, HSS 1/4" Hand Tap Hex Shank Drill Bits, Combination Drill and Tap Bit Hand Tools for Wood Drilling, Soft Metal, Aluminum, Iron - - Amazon .com
EBTOOLS 6pcs Metric Thread M3-M10 Titanium Coated HSS Drill and Tap Bits 1/4 Hex Shank - Walmart.com