1.this manhole cover grade:EN124 D-400.
2. SIZE: frame:DIA820MM*H100MM. opening:600mm.
3.weight:50kg.
4. bolt connect frame to cover.
5.make PVC or rubber seal ring.
6.make unti-theft lock.
also supply other type manhole cover.grateing.
grade:en124 B-125.C-250.D-400.