The 40-Piece Tap and Die Set, model 540, is a high-quality hand tool set made from durable alloy steel in Japan. This set includes various taps and dies for standard (SAE) measurements, making it ideal for various home and workshop projects. The tungsten steel construction ensures longevity and reliability for efficient and precise cutting and threading tasks. Perfect for DIY enthusiasts and professionals alike, this tap and die set is a valuable addition to any toolbox.