... 4",5",6.5" Material:40#steel It's easy to operate Pipe clamp/Steel pipe Clamp/Steel clamp ... , etc. 2.Pipe clamp also could be special use for high-speed railway; rapid transit railways,trestle, ... so on It's easy to operate.If you want to know how to operate it,you could send E-mail to us and ... we could send a video to ...