Whiteside Screw Type Helix Mortise Cutter w/Downshear, 25/32 in. CD is a precision tool designed for creating hinge mortises with ease and accuracy. This helix mortise cutter features a down shear cutting design that ensures clean, splinter- cuts, making it i for both handheld and machine routers. The cutter is equipped with a 1/4-28 internal thread size and requires the use of either a 1/4" or 1/2" shank Helix Mortise Arbor, sold separately. Constructed with a 2-wing carbide tipped cutter, it delivers durability and excellent cutting performance. Manufactured by Whiteside Machine Company in Claremont, North Carolina, this tool boasts a cutting diameter of 25/32" (.781"), a cutting length of 5/8", and an overall length of 7/8". Model Number: 13-781