400-24® manhole ring & cover or optional grate– cast gray iron. Stock item. Sold as sets or as individual ring, lid or grate. Cast iron riser ring is available standard as 3″ tall. Custom steel riser rings are available on special orders, and may be ordered with set screws as an option. Standard size steel risers for this set are stock items. H-20 traffic rated when 400-24® manhole ring is properly installed in reinforced concrete and used with a genuine 400-24® H-20 traffic rated cover or grate. Standard lettering available- Sanitary Sewer, Storm Sewer, BASS Storm Sewer, or Water. Other lettering, special lettering or LOGOs may be available or available on special orders. (we do stock many custom municipality specs) See individual items for specific ASTM information. Made In USA. LEED® certifications available on request. Please use the Contact Form or call us to request info & submittal sheets. 1-800-258-2278 Toll Free or (972) 263-1360 DFW Local.