#60 10pc HSS Wire Gauge Twist Drill Bits For Metal Working & Drilling Part #8260HDB; 10pc high speed twist drill bits great for metal smiths, metal working & drilling Ideal for drilling ferrous metals, tough casting sand forgings, working hardened stainless steel and other hard steels and tough high tensile strength nonferrous metals like titanium; These will not lose their hardness with excessive heat build up Each has a 1/16" shank; ; 1.0mm in diameter Pack of 10 in a plastic tube;