These tools have a much shorter Up-cut section than the standard compression tools. They are ideal for Mortising, grooving and dado, #46393, (D) diameter 1/4, (b) Cutting height 1, (D) shank 1/4, overall length (L) 2-1/2, B1 1/8, flutes 1, 46393 CNC solid carbide mortise compression spiral 1/4 dia x 1 inch x 1/4 shank