Whiteside Screw Type Helix Mortise Cutter w/Downshear 1-1/4 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 a compatible 1/4" or 1/2" shank Helix Mortise Arbor (HMA14 or HMA12), which are sold separately. Constructed with a 2-wing carbide tipped cutter, it durability and efficiency for professional woodworking projects. Manufactured by Whiteside Machine Company in Claremont, North Carolina, this tool is built to deliver reliable performance. Model Number: 13-1250A