... ).The size from 5" casing to 20" casing. Description :The Quick-operating Thread Protector is a manually-operated device for protecting ... simple, tough and secure, The fast and easy operation of Quick-operating Thread Protectors saves casing screw time, saves rig time ... manual locking and unlocking of the protector. To operate the Quick-operating Thread Protector, place the protector on the pin-end ...