I bought this bit to replace one I purchased nearly 20 years ago.  It withstood some pretty handling over the years before it began to show signs of wear.  It did not fail on me it probably still has some heavy work left in it.  I just wanted to make sure I got a replacement before I needed it.  I was afraid I would find out that they were no longer made by the original manufacturer and that I would have to settle for some cheap knock-off.  I was surprised to find it still available in its original form.  The new bit is every bit as good as the original.