I needed to drive 4" PVC into a plastic water butt. 4 1/4 is the perfect size and it cuts well. At least through plastic. Haven't used wood yet. It's a bi-metal blade, so think of it as the equivalent of the black drill bits that come with an electric drill.
Enhanced Cutting Efficiency with Olson FB23370DB 0 025 2 Inch Blade
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πͺ Durable DEWALT DW3986C Portable Blade 3 Pack for Efficient Cutting
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