Cleveland four-flute general purpose center reamer/countersink. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Stem oxide finish. Round shanks allow use with a wide variety of toolholding systems. Applicable for alloy-tool steel and cast iron materials. Used to countersink flat head screws and rivets. 1/2-inches tool diameter and 90 degrees point angle.