These tools have a much shorter Up-cut section than the standard compression tools. They are ideal for Mortising, grooving and dado, #46356, (D) diameter 1/2, (b) Cutting height 1-5/8, (D) shank 1/2, overall length (L) 3-1/2, B1 1/4, flutes 2, 46356 CNC solid carbide mortise compression spiral 1/2 dia x 1-5/8 x 1/2 inch Shank