Every drill bit is manufactured utilizing the highest quality materials using CNC technology and tested to exceed the highest industry standards. Titanium-coating prevents wear and corrosion, allowing for increased drilling speeds and longer bit life. This 14 piece set includes two 1/16, and one each: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64 & 1/4