Multi-Fab Blades are designed to provide multiple working surfaces on a single blade. One surface is flat just as on our flat blades while the opposite side is curved to provide maximum surface contact when cleaning a curved surface such as a tube, pipe or radius. The 1/4 thick edges allows access to tight areas. The maximum pipe/tube diameter is 6 inches for the RNB-T6, other size Multi-Fab Blades are available.