Whiteside Screw Type Helix Mortise Cutter w/Downshear, 33/64 in. CD is designed to create precise hinge mortises with ease. This versatile Helix Mortise Cutter can be used in both hand-held and machine routers, featuring a down shear cutting design that ensures clean, splinter- cuts every time. The cutter includes a 1/4-28 internal thread size and requires either a 1/4" or 1/2" shank Helix Mortise Arbor (HMA14 or HMA12), which are sold separately. Built with 2-wing carbide-tipped blades, this tool durability and high performance for your woodworking projects. Made by Whiteside Machine Company in Claremont, North Carolina, it measures 33/64" in cutting diameter, 5/8" in cutting length, and has an overall length of 7/8". Model Number: 13-515