Mill-Rose offers the most complete line of condenser tube and heat exchanger brushes available in four bristle materials:  High Carbon Steel, Stainless Steel, Brass and Nylon. Bristle sizes are graduated from .008" on small diameter brushes, to .010" on larger sizes to provide consistent cleaning power. Condenser Tube Brushes are single-spiral construction.  Double-stem, single-spiral construction with 1/4" NPT is available in brush diameters from 1-1/4" to 3" on a special-order basis.