Teeth wear out after trying to cut through drywall
This must be tin and/or aluminum as I only got through a hole in the ceiling and then my teeth fell out. Invest a few more dollars in a brand name that will last for many years. I do not recommend this item at all.
Pros
✔ HSS cutting edge provides impact resistance for the teeth and prevents chipping. Soft spring steel creates a flexible backing material that allows the hole saw to absorb shock when drilling holes in difficult-to-cut materials.