(1) The drag chain looks like a tank chain and is composed of numerous unit links that rotate freely between them. (2) The inner height, outer height and pitch of the same series of drag chains are the same, and there are different choices for the inner width and bending radius R of the drag chain. (3) The unit chain is composed of left and right chain plates and upper and lower cover plates. Each section of the drag chain can be opened, which is convenient for installation and disassembly without threading. After opening the cover plate, cables, oil pipes, air pipes and water pipes can be put into the drag chain. (4) Another separator can be provided to separate the space within the chain as required.(1) Material: reinforced nylon, with high pressure and tensile load, good toughness, high elasticity and wear resistance, flame retardant, high and low temperature stable performance, can be used in the outdoor, nylon content of the number of determines the use of the drag chain strength and wear resistance and running noise.Nylon content ranges from 5% to 17%, but exceeds 19%.Generally it's about 30%. (2) Resistance: resistance to oil and salt, and certain acid and alkali resistance. (3) Operating speed and acceleration (specific speed and acceleration depend on operating conditions). (4) Operating life. (5) Structure can not only play a role in mechanics, but also depends on appearance.The model of plastic drag chain is decided according to interior height and interior width commonly, because its are not standard product, outside dimension each manufacturer is inconsistent. Plastic chain models are 7*7, 10* 10,10 * 15,15 * 20,15 * 35,15 * 40,15 * 50,18 * 50,18 * 18,18 * 50,18 * 60,25 * 38,25 * 57,25 * 105, 35* 50,35 * 60,35 * 75,35 *100, 35* 125,35 *150, 45* 50,45 * 60,45 * 75,45 *100,45* 125,45 * 150,45 * 200,56 * 95,56 * 125,56 * 175,56 * 200,56 *300 and 55,62,65,80 series etc.