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These are some excellent quality American made bits, they just don't have a popular thread design.
IR #1 thread design steel, in the 3 shank sizes, is on the shelf and about 40% cheaper than new H. You can see pretty quick the savings if you use a lot of bits.
If you are drilling in real abrasive rock where bits get dull quick, you know that you can't make any money drilling with a dull bit and can't get in the footage. Dull bits are hard on your drifter or hammer and I'm sure you know what drifter parts cost. If you are drilling in reinforced concrete where you often hit re-bar and ruin a lot of bits, these are real cheap "throw-away" bits. If you even go through a few bits, it would definitely be worth the small investment in some IR Type 1 threaded drill steel or an adapter.
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