... on pairs of steel rollers, also machined to a smooth cylindrical surface, and set about half a kiln-diameter apart.Specification: MaterialDimensionMachiningNDTcarbon ... ,NF,DIN,JIS and so on;ISO 9001:2000;BV,CCS,DNV,NK,RINA,KR and so on.Weight:from 3 ... in our foundry, it’s suitable for casting due to their super large & non-standard dimension, then going into heat treating (annealing, normalizing ...