Suck rod hook is composed of hook, bail and locking assembly. The bail of suck rod is able to get into the hook without opening the locking arm. After the bail is on right place, locking arm reset (preventing the bail of suck rod get out of hook) under the function of spring which ensures the lifting safety of suck rod hook. In addition, put a bush on the spring in case the something gets into the locking assembly and get the locking assembly lost the function.
