10pc High Speed Steel Twist Drill Wire Size 78 (0.41mm /0.016in) Jewelry Tools
• Pack of 10 High Speed Twist Drill Bits Great For Metal smiths, Metal Working & Drilling • Great 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 • Shank Size if the same Thickness as the drill ordered •Wire Sizes 50 (1.78mm / 0.070in) through 80 (0.34mm/0.014in)