Champion Cutting Tool Screw Machine Length"Stubby" Drill Bits: 1705-S (12 per pack)-Made in USA
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Your query is far too broad. If you're looking for a thread drill size, we'll need to know how many threads per inch you're looking for. You'll need to specify drill sizes for threading different materials because you'll be using different drill sizes. Steel, cast iron, brass, and aluminum are some of the most common materials used in construction. If you want a tight fit, an interference fit, or a loose fit, you'll need different drills. My recommendation is to look up or obtain a Drill and Tap chart, and then determine what you require from there.
Letter bits are what you see here. P or Q are the closest matches, but neither is a true 21/64.
This is a question that has been left unanswered. What is the circumference of this object?
Selected User Reviews For Champion Cutting Tool Screw Machine Length"Stubby" Drill Bits: 1705-S (12 per pack)-Made in USA
The hole size is precise and true, and the cut is excellent.
Drilling into automotive components.