The Micro 100 Square End Mill Center Cutting is a high-performance end mill for milling a variety of materials. It features a square end design for milling 90-degree shoulders and angles. The center cutting design allows plunge cuts into the middle of a workpiece. It has 4 flutes and is made of solid carbide for durability and long tool life. The end mill has a 1/2" shank diameter and is available in multiple diameters from 1/8" to 1/2" for different milling applications. Overall, this is a versatile square end mill well-suited for shoulder milling, slotting, side milling, and contouring operations on materials like steel, stainless steel, cast iron, aluminum, and more.