This set includes six interchangeable steel tubes and a forged steel handle. For use with cutting board. Tube sizes: 5.0mm (3/16"), 5.5mm (7/32"), 6.0mm (1/4"), 6.5mm (17/64"), 7.0mm (9/32") and 8.0mm (5/16"). Wrench included. Pack Size: 7/SET