Ball has a simple structure steel thread protectors, and relatively smooth scrolling, durable. Ball Ground transportation using object must be smooth hard, the only way to achieve protection when transporting threads and sealing any direction for handling, transport and storage blocks and various types of bush thread protectors Laiyang thread protectors _ _ n Tong machinery supplied by Ning County is Tong Machinery Plastic Co., Ltd. Ning County is Tong Machinery Plastic Co., Ltd. (www.dzztjx.com) strong, credible, in Dezhou's plastic industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead positive Tong machinery and you hand in hand into the brilliant, for a better future!