HSS-Titanium Drill Bit Set -HighSpeed Steeldrill bits with titanium nitride coating, the high-grade metal drill bits with titanium-nitrideoffer a fantastic servicelife and high strength, for fast, clean drilling in the most diverse metals, plexiglass and hard plastics not suitable for use with aluminium. Up to 40 faster drilling rate than with comparable drill bits without titanium nitride coating. Up to 6 times longer lifetime when used with proper cooling. Low risk of breakage thanks to excellent elasticity. Supplied in a tough and durable case with a clear window so you can easily see and select the right bit for the job.