Expander with 3/4” (19.05 mm) long rolls suitable for tube sheet thicknesses from 1/4” to 3” (6.35 mm to 76.20 mm). Expander with 1 1/4” (31.75 mm) long rolls suitable for tube sheet thicknesses from 3/4” to 3 1/2” (19.05 mm to 88.90 mm).