Ball has a simple construction of various types of thread protectors and relatively smooth rolling plastic thread protectors and durable. Adopt universal object transported must be flat ground ball hard, the only way to achieve any direction within the conveying thread and external thread protectors should be self-locking, and resistance to vibrations generated during transport. On and breakout torque protection requirements refer to the manufacturer's procedures Xianyang thread protectors | thread protectors steel | n Tong Machinery (certified merchants) are provided by Ning County is Tong Machinery Plastic Co., Ltd. Ning County is Tong Machinery Plastic Co., Ltd. (www.dzztjx.com) is specialized in "Fuk Loi wheel, omni-directional wheel, universal ball, wheel and other two-way," the enterprise, the company adhering to the "honesty, hard service" concept To provide you with the highest quality products and services. Welcome to inquire! Contact: song manager.