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Updated November 2021
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BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.Read more 
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We recommend these products based on an intensive research process that's designed to cut through the noise and find the top products in this space. Guided by experts, we spend hours looking into the factors that matter, to bring you these selections.

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A hole saw arbor, also known as a mandrel, connects a drill chuck to the actual saw itself. As a result, a high-quality arbor is important in making sure you get cleanly cut holes each time. To choose the right arbor, you need to look at the compatibility of the shank size and drill chuck size. 3/8" and 1/2" are the most common although some use a 1/4" diameter. The shape of the shank will also influence how secure the arbor is in the drill. Flat and hex-shaped shanks are the best to keep the arbor secure in jaw-like drill chucks.

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