Suitable for various spinning machines for cotton,wool,linen,silk,chemical fibre blending and pure spinning. The interior structure uses disassemblable needle bearing. Inner and outer rings and rolling body are assembled through accurate selection and arrangement. The inner ring uses steel lines sealing to prevent dust and flyings in. The outer ring with waist drum outer shape has fine auto adjustment function. The product is examined by Quality Supervising and Examining Centre for Textile Machinery of the National Textile Society.