I own several Irwin tools and think they are well made and basically a one time purchase since they are durable and won't require replacement unless you lose it or it is stolen. These heavy duty bits are great for drainage holes or really any stepped hole. The zippered case is very well padded and sturdy. They may seem a bit pricey  and overkill for homeowners use, but I've learned the hard way that it is better and usually easier for the do it yourselfers to have reliable tools that makes the project go easier with considerably less frustration. Also the big orange store carries this brand and is competitive on certain items if you need it in a hurry.