We recently purchased a metric threading die set and have been very pleased with the results. Based on our own experience, these threading dies are of great quality, producing clean threads and machining the workpiece accurately .The set comes with a variety of sizes, giving us flexibility for different projects. The only con we have found is that the packaging is not very sturdy, so we had to transfer the dies to a more durable case. Overall, highly recommended for anyone in need of a reliable See full review