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This high-strength 4130 Chromoly steel shaft includes a machined keyway and is a direct replacement for the SWAG Off Road Hulk or an upgrade for the Harbor Freight roll bender. When used with the Harbor Freight roll sets, you will need to broach a 6mm x 6mm keyway in the drive rolls or purchase the Hulk roll sets. The keyway will keep your top roll rolling straight and avoid pushing like a set screw and reducing twist on the rolled material.
Note: Keyway and set screws are included with SWAG roll sets and not with the drive axle.