A multi-directional tumbling cylinder for use in concentrating or cleaning of products such as dross, salt cake, slag, or cast or molded metal pieces, comprising, - at least one cylinder having a length, said cylinder capable of turning in a clockwise or counterclockwise direction, said length of cylinder having an intake end and outlet end, - a series of rifling (8, 19, 23, 33) provided upon the inner surface of said cylinder and useful during rotation of said cylinder to process the product deposited therein, each of said rifling (8, 19, 23, 33) having a length, and each length of rifling (8, 19, 23, 33) having a pair of lateral sides (15, 16; 20, 21; 24, 25), wherein when said cylinder is rotated in a clockwise direction the product contained therein will be tumbled or moved in a direction upon encountering one side (15, 20, 24) of said series of rifling (8, 19, 23, 33), and when said cylinder is rotated in a counterclockwise direction, the product is tumbled or moved through its encountering the other side (16, 21, 25) of said rifling (8, 19, 23, 33), - a main product discharge is at the outlet end opposite from the intake end for longitudinal movement of the product during rotation; and - at least one side (15, 16, 20, 21, 24, 25) of the length of rifling (8, 19, 23, 33) is slanted either forwardly or rearwardly to the length of the cylinder thereby having a longitudinal pitch, characterized by - the cylinder being formed of liner segments inter-fitted together, - the liner segments having the rifling being integrally formed upon their interior surfaces and a series of vanes being integrally molded extending outwardly from the liner segments, and being disposed intermediate the outer surface of the liner segments and the inner surface of an outer cylinder, wherein said vanes have a similar shape and are contoured along its length as said riflings. - at least one cylinder having a length, said cylinder capable of turning in a clockwise or counterclockwise direction, said length of cylinder having an intake end and outlet end, said cylinder capable of turning in a clockwise or counterclockwise direction, said length of cylinder having an intake end and outlet end, - a series of rifling (8, 19, 23, 33) provided upon the inner surface of said cylinder and useful during rotation of said cylinder to process the product deposited therein, each of said rifling (8, 19, 23, 33) having a length, and each length of rifling (8, 19, 23, 33) having a pair of lateral sides (15, 16; 20, 21; 24, 25), wherein when said cylinder is rotated in a clockwise direction the product contained therein will be tumbled or moved in a direction upon encountering one side (15, 20, 24) of said series of rifling (8, 19, 23, 33), and when said cylinder is rotated in a counterclockwise direction, the product is tumbled or moved through its encountering the other side (16, 21, 25) of said rifling (8, 19, 23, 33), each of said rifling (8, 19, 23, 33) having a length, and each length of rifling (8, 19, 23, 33) having a pair of lateral sides (15, 16; 20, 21; 24, 25), wherein when said cylinder is rotated in a clockwise direction the product contained therein will be tumbled or moved in a direction upon encountering one side (15, 20, 24) of said series of rifling (8, 19, 23, 33), and when said cylinder is rotated in a counterclockwise direction, the product is tumbled or moved through its encountering the other side (16, 21, 25) of said rifling (8, 19, 23, 33), - a main product discharge is at the outlet end opposite from the intake end for longitudinal movement of the product during rotation; and - at least one side (15, 16, 20, 21, 24, 25) of the length of rifling (8, 19, 23, 33) is slanted either forwardly or rearwardly to the length of the cylinder thereby having a longitudinal pitch, characterized by - the cylinder being formed of liner segments inter-fitted together, - the liner segments having the rifling being integrally formed upon their interior surfaces and a series of vanes being integrally molded extending outwardly from the liner segments, and being disposed intermediate the outer surface of the liner segments and the inner surface of an outer cylinder, wherein said vanes have a similar shape and are contoured along its length as said riflings. the rifling being integrally formed upon their interior surfaces and a series of vanes being integrally molded extending outwardly from the liner segments, and being disposed intermediate the outer surface of the liner segments and the inner surface of an outer cylinder, wherein said vanes have a similar shape and are contoured along its length as said riflings.