ductile cast iron manhole cover,EN124 D-400.
1.size: frame:850*850*100mm.opening:600mm
2.weight:60kg.
3. make unti-theft lock.   PVC seal ring.
4.bolt connect frame to cover.
also we can supply all kinds of ductile iron manhole cover.grating.
type:
square frame square cover.    square frame round cover. round frame round cover.
grade: en124 B-125.C-250.D-400.
IF you need these products please free contact to me,i'll send catalogue for you at once.