bearing roller application:industrial,convoy roller material:metal(steel),rubber type:NR,NBR,SBR,CR,EPDM,Slicone,Viton,IIR bearing rollerfunction:used for matallurgy,mine,dock,printing and dyeing industry,plastic etc.features:anti-acid,anti-alkali,rust prevention,pressure-proofspecification:small diameter:just 20mm,less than 0.5kghuge diameter:length,1000-7000mm;weight,more than 12000kg.concrete ...