Review on MAGBIT 625 5816 MAG625 Carbide 16 Inch by Daniel Steele

I have purchased several sizes of Magbit carbide sand hole saws. These are the best hole saws I've ever used. In the past I have gone to my local big shop and bought all the branded instruments they sell which were all branded, usually Morse or Lennox and they have all done their intended job. However, when I needed this larger size, which no one sold locally, I had no choice but to order it. It turned out well, I was able to buy a much better racquet for less money. The grit is much coarser so it cuts much faster, especially on concrete blocks. While I have no real way of determining this, I'm pretty sure the granularity of these bits lasts longer than the finer granularity of others. Another advantage of these bits over other brands is that these bits tell you that they can be used in "sds" mode, I took that as hammer mode. I was hesitant to try this at first but eventually decided worst case scenario I would screw up the 30.00 bit and learn my lesson. I decided to try this after spending about 15 minutes drilling the front half of a concrete block with a 3 5/8 bit. The second half lasted about 20 seconds in hammer mode. Right from 15 minutes to 20 seconds. The only noticeable effect on the drill was paint rubbing off the sand after hammering. I don't know if other brands rate for hammer mode because they don't say so. These are definitely not the $100 diamond bits used by the pros and I don't expect them to last that long, but this particular bit has already drilled about 70 holes in the concrete block and is still working reliably. My only complaint about this bit is that I can't find the recommended rotation speed. Every hole saw I've ever used has a recommended RPM that depends on the size of the bit, for some reason these carbide grit bits don't. So for those who are interested, I'll start slow, once I get a decent groove it will rev up no matter what drill I put it in. None of the parts appear to have been damaged yet.