Whiteside Screw Type Helix Mortise Cutter w/Downshear, 49/64 in. CD is designed to create precise hinge mortises with ease. This versatile helix mortise cutter can be used with 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. Equipped with a 2-wing carbide tipped cutter, it durability and efficiency. Manufactured by Whiteside Machine Company in Claremont, North Carolina, this cutter boasts a cutting diameter of 49/64", a cutting length of 5/8", and an overall length of 7/8". Model Number: 13-765