Widin Carbide End Mill For Stainless & Exotics - 4 Flute Variable Helix Square Edge - 4 mm diameter is a precision cutting tool built for tough metals. The 4-flute, variable-helix geometry paired with a square edge delivers efficient chip control and a smooth surface finish, helping you produce clean parts with fewer passes. Designed for engineers, machinists, and hobbyists who work with stainless steel and other exotic alloys, this end mill combines a durable carbide body with a geometry that supports reliable performance across a range of feeds and speeds. Unequal index flutes for excellent chip emission: Efficient chip evacuation reduces heat buildup and helps achieve a smoother workpiece surface finish on stainless and exotic materials. High-hardness carbide edge for wear resistance: Durable cutting edge delivers longer tool life and consistent performance in demanding materials. 4-flute variable helix square edge design: Balanced cutting action minimizes vibration while producing precise, square-edged cuts for reliable results. This end mill helps you streamline machining workflows on challenging metals. The combination of chip-control geometry, wear-resistant carbide, and a versatile 4-flute design translates to fewer tool changes, less rework, and more consistent finishes—from roughing through finishing—so you can complete projects faster with predictable results.