2 Ferris Carving File A Wax Green Ring Tube This is a new set of 2 green Ferris File-a-wax ring tubes These are made for designing your own rings for lost wax casting These waxes can be sawed, filed or carved to achieve the desired shapes and it can be handled without softening Each tube is pre-drilled with a 5/8" (16 mm) diameter hole Each tube measures approximately 6" x 1 5/16" x 1 3/16" (152 x 33 x 30 mm)