Circular shield material: special cloth lined wire three anti-cloth; lined with steel wire plastic cloth; lined with wire asbestos cloth; lined wire high temperature cloth; a lined wire retardant cloth; lined with wire the fireproof cloth; lined wire Anti tarpaulin; lined with steel wire. Ordering requirements: The customer must provide the length of a stretch; thickness after two contraction; diameter of three pieces of protection; the four sheath maximum outside diameter requirements connection; five-use environment and material requirements of the technical description. The general circular shield sheath length after stretching and contraction thickness ratio of one meter than fifteen centimeters ratio larger or smaller retractable sheath products manufacture according to customer requirements This product has been widely quoted in the refining steel, foundry, oil prospecting, metal Quenched fields. Circular shield is a shield, it can effectively protect the screw, light bars, shafts, columns and other components from dust and external characteristics of pollution and damage, and to be able to do with the parts stretched or compressed movement, vertical or level of use can be. Level of use is recommended to use plastic or aluminum support ring, to maintain a uniform distance between the shroud cavity screw and prolong life. The metal ring in every compromise with the stretched length, mentioning that the stability of a high guard. Connection or fixed end usually use metal flange can also choose the ferrule type.