1/2 x 3/4 inch high speed steel corner rounding cutter ~ Designed for use in milling rounded corners, etc. ~ Form-relieved type, can be sharpened many times without changing the shape. ~ Right cutting ~ Radius cutter formed. ~ Radius is 1/2. "~ Mill diameter is 1-1/2"~ Shank diameter is 3/4. "~ Total length is 3-7/8"