I was very surprised at the durability of these drills. I bought these as a quick fix when I couldn't get the much more expensive ones I was using. As long as you use them at a relatively slow speed and submerge them in water, they will last a very long time.
Olson 80 Inch Blade FB14580DB-025
10 Review
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Enhanced Cutting Efficiency with Olson FB23370DB 0 025 2 Inch Blade
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