... , artistic, theftproof. long working life, abrasion resistance Manhole CoverTheftproof artistic manhole coverROUND TYPECover size:diameter 500mm, 600mm, 700mm , ... C250 ,D400We could make BMC, SMC, FRP Composite with Manhole cover: composite materials, artistic, theftproof long working life, ... Benor Machinery CO.,LTDWe are the manufacture of Manhole Cover for more than 15 years.The standard is ...