FH the oil field pipe comes with one end threaded on the outside and one end threaded on the inside so that the joints will screw together, the end with the exposed threads has a thread protector on it, that basically just unscrews and has no other use than that. If the pipe were shipped without the thread protectors on it, then when it came time to use it, they might have damage and wouldn't screw onto the joint of pipe they are puttin on next. I'd think they'd reuse them(thread protectors), maybe they just drop a few here and there or they fall off their trucks and they don't find them. (until a cow steps in one )