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All spiral saws are sacrifical in nature and will lose their edge quick so no surprises here. The edge dulls quickly when cutting a mix of thick drywall/plaster. I went through two of these to cut eight 14" x 6" holes in my 1950's era home for HVAC vents and *barely* made it. A repeated 'plunging/sawing' action was required to get it to cut effectively. Three star rating due to misleading description about long life. It did make a tough job easy but be prepared to buy a few to get the job done.
Dewalt made a really nice piece here. Carbide holds its edge for years and is a great investment.Compared to the spiralsaws this is alot less likely to break and can handle dental stone without a problem. I always buy carbide 7 1/4 blades for my saw because they slice through flooring like a hot knife through butter. Put this into the dewalt 18V cutter and off you go, no matter what the material.
Lo use al rededor de tres veces, para la ultima vez, la punta ya no tenia filo, para mi guto y el uso que le di, el filo de la punta se desgato muy pronto, esperaba mas tiempo de vida del producto, por el prestigio de la marca Dewalt.
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