Heavy-Duty Contact ClampMagnaflux contact clamp accessories allow testing of parts that could not be placed in wet bench MPI units. Magnaflux spring loaded and heavy duty contact clamps allow for the easier and more accurate inspection of tubing, bars and tubular assemblies such as aircraft engine mounts, fuselage sections and large welded structures. Connected to terminals by lugs and flexible cables, contact clamps can be used with parts up to 7" in diameter.