CNC machinists and metalworkers, meet your new favorite end mills! This 5-piece set of ZZBD-CT Carbide Radius Corner Rounding End Mills is absolute perfection for creating smooth, rounded edges on alloy steels, hardened steel, and various metals. The R4*75mm size gives you plenty of working length, and the 4-flute design ensures efficient material removal with a fantastic finish. But here's the real star - the TiSiN coating. This titanium silicon nitride coating is seriously tough stuff, providing high hardness and incredible heat resistance that makes these end mills perfect for hard cutting applications. Made primarily from tungsten carbide and cobalt, these tools maintain their edge hardness even at high temperatures that would wreck ordinary end mills. They're compatible with most desktop and industrial CNC machines (just make sure you've got the right collet size!). Whether you're working on precision parts, molds, or any project that requires perfect radius corners, these end mills deliver professional results every time. The set comes with everything you need to tackle those corner rounding jobs with confidence and precision that'll make your work stand out.