This spade is one of the best industrial drilling tools I've ever used .Using this product our team found that it cut through metal like butter and made our work much more efficient. The 25 4mm size WAS perfect for our needs and the overall build of the spade felt sturdy and durable. The only downside was that it was a bit on the pricey side, but the quality of the product made it well worth the investment. Overall, we highly recommend this spade for any industrial and scientific drilling needs..