HHIP 2006-0452 - 10 Piece 1/2" Shank woodruff keyseat cutter set is made of high speed steel. Straight tooth set is designed for use with normal end mills for milling standard woodruff keyseat, slots, etc. Includes 204, 305, 403, 404, 406, 505, 606, 608, 806 & 808. See chart picture for dimension information.