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 features a square end for milling 90 degree shoulders and corners in aluminum, steel, stainless steel, cast iron, titanium, plastic and other materials. The center cutting design allows plunge cuts into the middle of a workpiece. The TiAlN coating provides high hardness, heat resistance and lubricity. Overall, this is a versatile, durable end mill well-suited for a range of milling operations.