Whiteside Screw Type Helix Mortise Cutter w/Downshear, 1/2 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, sold separately) for operation. With its 2-wing carbide tipped cutter, it durability and efficiency for your woodworking projects. Made by Whiteside Machine Company in Claremont, North Carolina, this tool measures 1/2" cutting diameter, 5/8" cutting length, and 7/8" overall length for optimal performance. Model Number: 13-500