Whiteside Screw Type Helix Mortise Cutter w/Downshear, 7/8 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, making it suitable for various woodworking applications. Its down shear cutting design ensures clean, splinter- cuts, enhancing the quality of your work. The cutter features a 1/4-28 internal thread size and is equipped with two carbide-tipped wings for durability and efficient cutting. To operate, it requires either a 1/4" or 1/2" shank Helix Mortise Arbor (HMA14 or HMA12), which are sold separately. Manufactured by Whiteside Machine Company in Claremont, North Carolina, this cutter reliable performance with specifications of 7/8" cutting diameter, 5/8" cutting length, and 7/8" overall length. Model Number: 13-875