Review on MKC Recessed Carbide BI Metal Mandrel by Kendro Givens

I bought this product to install a ceiling light. The hole saw I bought from Home Depot, or any other regular saw, is not good for my job, I can only cut one hole and the teeth are fully drilled. This is amazing, a carbide saw I've tried with 8 hole drywall and the saw is still sharp, still works great. The only problem is that the saw is not round. I received a slightly better replacement than the first one I received.