I recently purchased a diamond bit for my stained glass projects and it has exceeded my expectations. Industrial and scientific in design it quickly grinds down ROUGH edges and is great for intricate detailing. after I put it to the test, I was impressed with how durable it is. The only downside is that it can be a bit noisy, but that's a small price to pay for such a reliable cutting tool .Overall, i highly recommend this product for anyone in need of a reliable diamond bit for their stained glass projects..