This bit is advertised as being for acrylic and plexiglass, but I'm pretty sure it's just a plain old bit. The drill bit I received was black and doesn't look anything like the one in the picture above. It left cracks and chips in every hole I drilled in the new Plexiglas for my boat (about 8 in total). $200 down the drain for this scam product. I had to test this on my old glass, but I trusted the list. Lesson learned. Do not buy this drill bit if you are drilling plexiglass or acrylic.