Brand PSL is senior specialist for heavy duty. About the process of slewing rings, our qualified engineers track it from the raw selection and its quality inspection to producing process, until the following inspection of final products, and finally you will get satisfactory product. So, now before starting our cooperation, weâ??d like to provide you pre-service till we reach an agreement about your requirements. There is one thing that has been settled, your required products would be delivered in 30 working days. Contact us now! PSL series slewing ring Four point contact ball slewing ring without gear with external gear with internal gear Crossed roller slewing rings without gear with external gear with internal gear -