![]() ![]() Well worth it to be able to reliably do the job it needs to do. A good set of drill bits that will do the full range of stuff you need on job sites probably costs less than $150. That way, I don't have to worry about the tool not doing the job, and having to go back to the shop for another and delaying the work. If I was out in the field, going to different jobsites, trying to do a professional level job, I would have the best I could afford that would do the work. If I was working at home in my shop, no deadline, and have no real interest in the quality and outcome of the work, I'd use cheap tools. My mindset is a bit different on cheap tools. 0005" graduations in most cases less expensive that. I am sure that there are other suppliers out there that can do the same, just my personal preference, MSC is a great source for these, you can choose your quality level depending on your personal preference, from top quality, everyday production requirements to 1 time home shop use. You will find multiple number, letter and fractional sets, with maybe a handful of metrics. Personally, in my home shop as well as the shop I supply for the school, If you check prices buying individual drill bits, say to refill an index, you will find that you can buy fractional, letter and number drill bits to fill almost all of the metric sizes for a fraction of the cost of buying metric sized bits, and you will find that these will cover 99% of metric sizes. The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.As a "professional" (as in this is how I have made my living for the last 30 years) machinist, I agree with not buying chinesium drill bits (or taps) from anywhere.Most other countries, especially in Europe, have abandoned them entirely in favor of metric systems. They are also seen in the UK to a lesser degree, having been largely replaced by metric sizes. Although they originated in the 19 thcentury, these gauges are still commonly used in the U.S. ![]() They are loosely based on the Stubs Steel Wire Gauge, with gauge sizes that are similar (but not entirely identical) to that system. Number and letter gauges for drill bits do not follow a formula or standard increments.
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