Revain was the ONLY place I could get this hard to find hole saw. I went to all the hardware stores in the area and none had it, all the salespeople seemed surprised too. I am so grateful to Revain for having everything I need. That summer my husband and I decided to install a Hybrid Roof Gutter Growing System (RGGS) and we needed to find a hole saw that would fit the 3 inch mesh. And can easily drill food grade PVC and 55 gallon plastic drums. To use this I had to purchase a Dewald DW1803 Heavy Duty 7/16" Quick Change Shaker. I will also leave a similar review for this product. Without it you cannot use the hole saw. I don't build, just am one Mom doing things with her own hands and learning to do things as she walks I had to watch a video on how to load the shank and also learn how to use my new drill... (see, I I'm really new to all this.) I got started fairly quickly and probably drilled over 100 holes in 4" PVC and 3 holes in each of the barrels which my husband cut lengthwise. Now I have described myself as an exceptional hole saw drill. If you're listening to Larry Hall, the guy who started this self-watering garden, you're probably looking for a hole saw of the same size...here's a tip for you. Start drilling forward as you normally would to set the drill, then rotate the drill and run with constant pressure and you have a nice smooth hole.