This RedLine Tools 4-Flute Variable Index and Helix Square End Mill (REP4031) is a precision cutting tool made in the USA from high-quality carbide. Featuring a 0.22-inch cutting diameter and 0.25-inch shank diameter, this square end mill is designed for superior performance in machining applications. The variable helix and variable index design helps reduce chatter and improves cutting stability, while the premium AlTiSN finish enhances durability and heat resistance. With its 4-flute construction, this tool provides excellent chip evacuation and surface finish quality. The compact design measures 2.5 inches in length and weighs just 10 grams, making it easy to handle and install. This professional-grade end mill is ideal for precision milling operations in various materials, delivering consistent results for demanding machining tasks.