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D. Lux
Comentado en los Estados Unidos el 27 de mayo de 2023
I bought this 4½" core hole bit to drill through a six inch stem wall to accommodate a drain line for a home addition. This bit was legit! It cruised right through 50 year old concrete with large aggregate. I used it with a 1-1/4"-7 Male to 1/2" Shank Core Drill Adapter on a couple of harbor freight drills. The first one (a hammer drill in drill only mode) lasted about 4" of the hole before nearly catching fire. I went to harbor freight and bought two more drills with a 1/2" chuck on clearance, but thankfully the first one did it. I set up a centering rig to get the bit started (see my pics) and had no trouble at all getting going. Keeping the thing aligned, water going in properly, and not breaking my wrists were the tricky parts. All told, even with the half hour side quest to harbor freight mid drill, it was over and done with from unboxing to pics in roughly two hours. I would say actual productive drilling time was max 30 minutes.
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