There is usually a large slot for inserting a screwdriver to push the cut out part and remove it from the hole saw. It took some effort. I had to stick a screwdriver between my teeth and cut out the wood and fidget with it for a while to knock the piece out. The hole saws were also very greasy/oily, apparently due to manufacturing. Overall I'm satisfied as the price was very low and it worked so you get what you pay for.
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