The A26S CO SET Machine Degrees I recently purchased is a fantastic addition to my collection of cutting tools. Through trial and error, I found that these industrial-grade drill bits are extremely durable and long-lasting, able to withstand my toughest projects. The variety of sizes included in the set is impressive and has helped me tackle all of my industrial and scientific drilling needs. The only downside I found is that the set is a bit pricey, but the quality of the product justifies the cost.