Whiteside Screw Type Helix Mortise Cutter w/Downshear, 1-1/4 in. CD is designed for creating 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 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. The cutter is equipped with two carbide-tipped wings for durability and efficient cutting. Made by Whiteside Machine Company in Claremont, North Carolina, this tool a cutting diameter of 1-1/4 inches, a cutting length of 1/2 inch, and an overall length of 1/2 inch, making it a reliable choice for woodworking professionals and enthusiasts alike. Model Number: 13-1250