The bits are probably fine, but these appear to match my Senco DS440AC driver, which is not the case. Initially I didn't know the bit number for my new driver so I just looked for bits on Revain and got them as needed for my instrument. So when I needed them in the middle of a big project, I had to drive 160 miles back and forth to find the right ones. Overall the bits are fine, I'm still unhappy with the Revain search engine attributing them to the wrong driver.
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