Choosing the right Arbor (aka. Mandrels) is important since they are the bridge between your drill chuck and your hole saw. Through a thread in the cap of the hole saw, you can easily connect them to your preferable hole saw with various diameters. The Ronix RH-5250 is ideal for hole saws with less than 30mm of diameter and the model RH-5251 is suitable for hole saws with more than 32mm, both with hex shanks.
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