Weldon shanks feature a round shank with one of more flats machined into the side for easy indexing and alignment The 5/16 diameter with 3/8 inch cut length gives you that perfect balance of strength and reach for detailed work. Made from high-speed steel, it offers that ideal combination of hardness and toughness that stands up to demanding materials without chipping or dulling too quickly Drill America DWCT series high speed end mill designed to machine most materials of medium hardness such as steel, brass, bronze and iron. 2 Flute Single End Extra Long - Detroit Industrial Tool Ball End Mill Drill America - 5/16 X 3/8 HSS 2 Flute Single End 2 Flute Single End Mill Available in polished finish Drill America - DWCT1110 5/16" X 3/8" High Speed Steel 2 Flute Single End Ball End Mill | DWC Series. $43.99. $2998USD. Product Score. expand_more High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance It can be used for general-purpose milling including profiling, slotting, keyways and pockets.