This is a very high quality bit that has been designed to do its job well. I had a need to drill holes in installed marble tile. Cracking a tile would mean a very expensive repair job or an unsightly patched crack. This bit drills nice smooth holes through 3/8" marble in about 2 minutes. It is extremely easy to drill on the floor since the water puddles up and only needs to be renewed every 15 - 30 seconds or so. I haven't tried it on the wall yet but I did buy the wall watering and guide kit (only about five bucks). The guide was useful on the floor also just to get the hole started in the right place (you should hold the guide in place with your fingers to help keep the suction cups from sliding around). Remember to clean out the "core" if it seems to stop making progress. Excellent product. I was surprised not to find any competitive products by the other big name tool manufacturers out there but that is probably because it is patented. I would say not to hesitate to order now unless you need the bits today. A big chain home improvement store with 5 letters that starts with an L and ends with an S has these bits in my local store for much less money.Get more detail about Hitachi 728026 5/16-Inch Diamond Core Bit.
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