857-5, 800-5 Series Adjustable Type Parallel Tube Expander with 5 Rolls for Thin Wall Tubes Suitable for 1'' OD X 21 BWG (0.81mm), 22 BWG (0.71mm), 23 BWG (0.64mm), 24 BWG (0.56mm), 25 BWG (0.51mm) Thick Tubes.