Used for the sprindle tape tension between the sprindle and rolling tray of various cotton wool,linen,silk,fibre fine yarn machines and twisting frames with roud sprindles. It can be used in various of brackets for tension treys. Its interior construction uses single vertical surfaces hear ball bearing and double vereical surfaces bearing. The inner and outer rings are made of GCY 15 steel. They have many distinguishing features,such as strong bearing capacity,high rotational precision,long service life,etc. The product is examined by Quality supervising and Examining centre for Textile Machinery of the National Textile Society.