It appears (well if you believe the auto-translation by Google Lens, anyway) to be a spare blade for a commercial guide saw available in Japan at least. We found it particularly pleasing to see ...

nothing beats a digital blade tension gauge for repeatable results. Despite being an aftermarket accessory for his beefy Hitachi CB-75F bandsaw, [Stephen B. Kirby]’s Pi-based tension guide looks ...

For this guide, we chose the five most useful options ... Table saw: Unlike other saw blades that drop down, table saw blades stick up and require you to slide lumber into them to make your ...