As a result of my tests, I determined that this industrial drill bit is far from being "bulldog tough." It failed to make a clean hole and left a jagged edge on the material. It's also too short to handle thicker pieces of material making it useless for more demanding tasks. The only positive thing about this drill bit is its price, but the quality surely does not match. Save yourself the disappointment and opt for a better-quality industrial and scientific drill bit..