Precision machining demands precision tools, and this RedLine Tools 4-Flute Variable Index and Helix Corner Radius Square End Mill delivers exceptional performance for professional applications. Made in the USA from high-quality carbide with an advanced AlTiSN finish, this end mill features a 0.31-inch cutting diameter with a matching 0.31-inch shank diameter. The variable helix and variable index design significantly reduces chatter and vibration during operation, allowing for smoother cuts and extended tool life. With a corner radius of 0.02 inches, this tool excels at creating clean, rounded internal corners while maintaining dimensional accuracy. Measuring 2 inches in length with a 0.44-inch width, this compact yet robust tool weighs just 10 grams, making it easy to handle and install. The REP4067 model is specifically engineered for precision milling operations where surface finish and tool longevity are paramount.