Whiteside Screw Type Helix Mortise Cutter w/Downshear, 13/16 in. CD is designed to create precise hinge mortises with ease. This versatile cutter can be used with both hand-held and machine routers, featuring a down shear cutting design that ensures clean, splinter- cuts every time. It includes a 2-wing carbide tipped cutter with a 1/4-28 internal thread size and requires a 1/4" or 1/2" shank Helix Mortise Arbor (sold separately) for operation. Crafted by Whiteside Machine Company in Claremont, North Carolina, this cutter reliable performance with a cutting diameter of 13/16", a cutting length of 5/8", and an overall length of 7/8". Model Number: 13-812