Review on 🔩 Triumph Twisted Drill Company, September 5, 2017 by Eric Pruett

This drill bit set (made in USA) is excellent. The bits are made from high-speed steel with a mirror finish and are ground at an angle of 118 degrees on one side. Triumph also makes a similar set in black oxide with a 135 degree V-point. (In fact, they make a variety of drill bits.) HSS is tough and can cut through most regular steels with ease. However, I'll probably grind them to a 118 degree V-point, which tends to move less and cut with less friction. Realize that the advantage of high-speed steel (HSS) is that it can withstand higher temperatures than carbon steel. . So if your bits can get hot during sharpening or use, HSS is by far the best drill steel. Carbon steel can be quite hard, but doesn't handle heat well. The Triumph twist drill website (http://triumphtwistdrill.com/) is a little search unfriendly but has great information on a wide range of bits and how they are made. methods. While Revain offers a small number of Triumph bit sets, Carbide Processors offers virtually all Triumph bits. You can buy cheap imported bits that won't last long, or you can buy USA made Triumph bits made from high quality tool steel.