The hold ring includes {HEAD ~ a groove} in {TAIL ~ a ring like shape} for constituting a burr storing space at an outer periphery thereof and is welded to the inner periphery of the socket by ultrasonic welding 
in
The hold ring includes { HEAD ~ a groove } in { TAIL ~ a ring like shape } for constituting a burr storing space at an outer periphery thereof and is welded to the inner periphery of the socket by ultrasonic welding
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH