Cutting mortises for hinges and locks can be challenging; the mortise depth must be accurate for smooth operation and the edges must be sharp for a clean, professional installation. These mortise bits make hardware installation a snap. The large gullet between the two flutes clears chips away quickly and the cutter geometry creates a crisp outline for a perfect fit., #45505, diameter (D) 1-1/4, cutting Height (B) 3/4, shank (D) 1/2, overall length (L) 2-1/4, flutes 2, 45505 carbide Tipped Mortising 1-1/4 dia x 3/4 x 1/2 inch Shank