... deflection. Llittle friction and low noise!Model:SBR10UU, SBR13UU, SBR16UU, SBR 20UU,SBR25UU, SBR30UU, SBR35UU, SBR40UU, SBR40UU, SBR50UU.SBR16LUU,SBR20LUU, SBR25LUU ... ,SBR30LUU, SBR40LUU"SBR...UU" means LM series open bearing type unit."LUU" means ...