The Micro 100 Square End Mill Center Cutting is a high-performance end mill designed for milling a wide range of materials. This 1/4" diameter, 4 flute end mill has a square end for milling 90 degree shoulders and slots in aluminum, steel, stainless steel, cast iron, titanium, plastic and other materials. It features a TiAlN coating for heat and wear resistance when machining at high speeds and feeds. The center cutting design allows plunge cutting and drilling. Overall, this is a versatile, durable end mill well-suited for high performance milling operations.