... .various of kinds building material machine; Baking-free brick machineLow prices, high quality, integrity, common developmentRoll diameter (mm): 280~320 ~ 380,420 ... ~ 480,520 ~ 610~800Roll diameter (mm): 280~320,320 ~ 380,420 ~ 480,520 ~ 610,610 ~ ... opening.4.Roll balance balance with multiple disc spring.5.Bearing lubrication with dry lubrication oil lubrication and oil and gas ...