If you are sick of going to get a 5mm drill and find something that looks like 5mm but not sure if it’s a 4.5mm or a 5.5mm nevermind a 4 or 6, Drill-Gauge Set is for you.
Woodstock D4141 isn’t high precision gauge, some small indexes are wrong. It is difficult to separate fractional and wire size drill bits that are only a few thousandths of an inch different in diameter. For better precision, you can use more expensive Irwin gauge
But gauges are made of non-cheap metal, very durable, and accuracy for medium and big diameter bits is good enough. If you use it for your DIY projects and don’t need ridiculously tight tolerances, it is your choice.
I think, that with carbide tipped drills you really do get what you pay for. Therefore, If you are drilling a lot of holes or very large holes (let us know please) you might be better off renting a rotary hammer.
Drilling in concrete can vary quite significantly. Block will be much softer than poured concrete and the age of the concrete also maters. It keeps curing for decades so old concrete can be insanely hard to drill in to with a hammer drill. The bigger the hole you are trying to drill the harder it gets. If you need to make lots of holes and it’s really becoming too difficult you might be better off renting a rotary hammer. That will punch through with minimal effort.
This set is cheap and works well for a home use. With a hammer drill you usually don’t drill often If you drill hundreds of holes a day, better buy a high-quality one and think about SDS drill, it is MUCH more productive.