Features of "800-5" Series Five Roll Tube Expander For Thin Wall Condenser Tubes Use : Highly recommended for use on thin walled condenser tubes (19 thru 24 gauge walls) of Stainless Steel, Titanium, Incoloy and other exotic materials. Advantages : Gives a more concentric and even expansion when expanding thin walled condenser tubes vs. a conventional 3 roll condenser tube expander and reduces tube spring back effect.