This rubber band fits the MetalAce 3x8 inch upper wheel and allows you to use the English wheel for making radius bends in sheet metal. The rubber transfers all the bending to one axis, rather than two. Works best under low pressure on a high crown anvil. Made from tough EPDM material for long life expectancy. Expand your metal shaping abilities with this simple add-on. Note: Can also be used on 7 inch diameter upper wheels, or slit to a 2 inch width for use on the MetalAce 2x8 inch upper wheel.