Through trial and error I found that these titanium nitride-coated drill bits from this brand give speedy results, delivering precise and smooth holes in hardwood, metal, and other challenging materials. The bits pierced through easily without dulling or slipping... One con of these bits is that they may true up a bit when drilling through softer materials, but that is a minor hindrance compared to the efficiency they bring. These bits are a great addition to any DIY enthusiasts toolbox..See full review