Column roller bearing generally is guided by two flange of a axle bearing lasso , keeps a rack, the running pulley is to may separate the type axle bearing like guiding a lasso to be composed of one combination document. This kind of axle bearing installation , disassembly go to the lavatory comparatively, especially having demonstrated whose merit more while demanding the inner , the outside lane to had had having a surplus of composition with the axis and monoblock. Roller bearing is separated type axle bearing by a column , installation and disassembly go to the lavatory very much!Especially having demonstrated whose merit more while demanding the inner , the outside lane to had had having a surplus of composition with the axis and monoblock. Roller bearing is separated type axle bearing by a column , installation and disassembly go to the lavatory very much. Column roller bearing is single-row , pair of columns and four columns mark. Apply the single-row column roller bearing that more being has to keep a rack among them. Besides, still have other architectural column roller bearing such as single-row or pair of Lieman dress running pulleys.