Attention metalworkers and machinists! This 1/8-40 UN tap and die set is perfect for creating precise threads in your projects. The tap is made from 6542 high-speed steel (that's M2 grade for you tool geeks) and features straight flute design for efficient chip removal. The matching die is crafted from durable alloy tool steel that can handle repeated use. Both are right-hand cutting with 2B/2A accuracy class - which basically means they create really precise, clean threads every time. The tap works great on through holes and shallow blind holes in materials like copper, brass, A3 steel, aluminum, and cast iron. The die is perfect for repairing external threads or creating new ones. When using these, remember to go slow on harder materials and use some cutting oil to keep things smooth. The die has that conical locking hole that grips tight in your wrench, so it won't slip during use. Whether you're using them with your bench drill, CNC machine, or going old-school with manual operation, these tools deliver professional results. The set comes with one 1/8-40 tap and one matching die - everything you need to tackle those fine 40 TPI thread projects. For the price, you're getting quality that'll last through plenty of projects without wearing out or breaking. Serious tools for serious work!