Bought this to drill through the aquarium glass. As soon as I opened it I found an error. It can be seen in the photo at the 3 o'clock position. Despite its small size, it's a diamond blade that cuts glass by friction. It worked but caused a few chips when cutting through the glass and a few less than perfect cuts in the glass, but again it's a hole. The fitting that goes through the hole closes all but one of the tasks I've drilled so far (5 total). If you are looking for a cheap but effective hole saw, this is acceptable. What I got could have been an accident. I will buy another one, it works for my needs with an acceptable failure rate.
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