Ductile iron casting manhole chimney grating.It has two locks.Stainless chrome nickel steel is used at the lock bolt.Rectangle GratingMaterial*EN GJS 500/7 & DIN GGG 50Class*D 400Product Info Product weight is 47 kg. Manufactured in compliance with EN124 NotesWeight tolerance: plus or minus 2 kg (up to 24 kg)plus or minus 3 kg (24�125 kg)and plus or minus 4 kg (over 125 kg).