American Carbide Tool Carbide-Tipped Tool Bit for Straight Turning, Right Hand, C5 Grade, 0.25" Square Shank, AR 4 Size AR-style tool shape has a 0-degree side cutting angle for straight turning, facing, or boring to a square shoulder C5 grade uncoated carbide tip for roughing and heavy machining of steel and steel alloys Right-hand cutting direction for right-to-left feed Positive rake angle provides a sharp edge for making continuous cuts Square steel shank fits square toolholders