This document provides information on rigid steel conduit and fittings in Vietnamese, including:
1. A table listing specifications of rigid metal conduit in various sizes from 1/2" to 4" including outer diameter, thickness, and length.
2. Descriptions and materials of related fittings like couplings, elbows, and bodies for connecting the rigid steel conduit.
3. Product codes, sizes from 1/2" to 4", and material specifications for each type of fitting.
The document appears to be a specifications sheet for rigid metal conduit and fittings provided by a Vietnamese company.