This square end mill is made out of high speed steel with a bright (uncoated) finish. It is double end with a Weldon flat 3/8 inch diameter shank. This square end mill is designed for use with aluminum, cast iron, hardened steel, nickel, stainless steel, steel, and titanium, and is for finishing and centre cutting. It also has right hand cutting direction, along with four flutes and 3⅜ inch length.