This product is applicable to the yarn-drawing on the domestic FA601 and SQ1A and imported BD200 and HS-6T open end-spinning frames. The roller bearing to be used on FA601 and SQ1A has a two row ball structure,dexterous and quick-in action,features a good dust-proof effect and a long service life. The roller bearing to be used on 3D200-CS6 and HS-6 has a parted structure. Its casing can be easily mounted and dismouted for maintenance when the rubber is worn out,allows an easy lubrication and maintenace. The bearing of this creation runs smoothly.