DIY - How to use free hole saws efficiently

This tool is used to hollow out a piece of wood in a circle of the desired size.
It leaves a hole in the middle, but this is a good way to use that hole.
I hope this will be helpful.
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Hi, I'm Gonta DIY.
I work as an Mobile App Engineer in my day job. In my free time, I'm constantly challenging myself with different DIY projects. I try to create a living environment that brings comfort and joy. From car camping DIY to room renovations, crafting small items, woodworking hacks, and more, I share the diverse stages of my projects on my channel.
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