I order Milwaukee 49-56-0237 4-3/4" ice hardened hole saw for cutting pc cases for 120mm Fan. It just won't cut unless I'm working on a hole for hours and using a lot of electricity, not to mention burning the rubber belt on the drill. lol. I thought Milwaukee had a good reputation as a brand. I have a second one Thoughts I rma it and hope they will be happy to refund my money.