Gorilla Mill Baboon. Based on the original 5 flute Gorilla Mill, the Baboon for high temp alloys features geometric enhancements that make it uniquely suited for difficult-to-machine materials including inconel, waspaloy, hastelloy, rene, stellite, 17-4 SS, 15-5 SS, 13-8 SS and titanium.These steel balls are worthy of your ball mill operation. FOX Stainless Steel grinding balls are Martensitic and can be through hardened to 60 HRC. They’re magnetic, too—which offers advantages in certain applications. All in all, these grinding media balls are ideal for use in applications, where corrosion resistance is required.