... : used in enlarge and reduce diameter, such as pipe plug, automobile oil pipe, w Details:1. Main use: used in enlarge and reduce ... diameter, such as pipe plug, automobile oilpipe, water pipes, refrigerator ... steady, low noise,little vibrancy 3) Size: SG-1-40, SG-1-50, SG-1-80, etc.Packing: Wooden box Pipe end processing Machine