I recently purchased a bi-metal hole saw for my industrial and scientific projects .Through trial and error, I found that this product is the best in the market. With its sharp teeth and durable construction, it cuts through materials like butter. The saw`s teeth remain sharp even after REPEATED use. The only downside is the product's price which is on the higher side. However, it’s worth the investment as it outperforms other hole saws in the market. Overall, I would highly recommend this product to anyone who needs a reliable cutting tool for their projects..