This manhole cover is made from galvanised steel with a strong polypropylene frame.It has a 10 Tonne load rating, which makes is suitable for use in all domestic driveways, restricted areas and service areas.Like all manhole covers, the size refers to the clear opening size – in this case 450mm x 450mm (18 x 18).The actual overall size of the cover within the frame is 470mm x 470mm, and the overall size of the cover including the frame is 513mm x 513mm x 23mm.This strong and robust quality manhole cover combines a smart appearance with a high load rating.This manhole cover is made by Clark-Drain.The technical specification sheet for this product can be viewed and downloaded by clicking here.