They are all level 80 chains. How can we distinguish its quality? It can be distinguished from the following aspects, surface, size, tension, material. Surface: Check whether the position of the R arc of the chain is smooth and whether there are obvious depression. Is there a burrs at the welding? Size: Look at the inner length of the chain ring, whether the inner width and outside width of the welding are standard. Relic: After the chain is made, you need to do a tensile test to see if you reach the standard tensile value. Material: 20mn2 alloy steel. Therefore, it is all 80 -level lifting chains, and the quality is still divided into many types.