Man hole covers required-The manhole material is HDPE or composite ..... Not casting. Some of the suppliers name it (Telecom manholes) others named it (Handholes). 60W x 80L x 60D CM--500 NOS, 60W x 60L x 60D CM--500 NOS, Assemble SMC Manhole is made of Sheet Molding Compound(SMC) material with high material strength and climate-stability performance