Lenox are the hole saws that we usually use in our work. I'm an electrician and I use hole saws to cut holes in steel boxes, aluminum lids, drywall, castable rubber grommets, among other things. In my experience, Lenox saws work well. The price I paid for this kit was exceptionally low so I bought it for personal home use. What I like best are the stepped holes on the sides of the saw. They make removing the plug much easier.