The Makita D-72229 HSS TiN Metal Drill Bit Set 19pc is ideal for professional use as the drill bits have a titanium-nitride coating, this means that they produce minimal levels of friction and therefore reduces friction deposits, keeping the work area clean and tidy and not causing any damage or staining.<br><br>The HSS construction ensures these drill bits are suitable for alloyed and non-alloyed steel.<br><br>Bit Sizes: 1,1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5,8,8.5,9,9.5,10<br>