ringbolt

If I was as small as you, or a ringbolt chaser like Chips, I might be able to do it.

And he readily made the painter fast to a ringbolt at the stern of the speed boat.

I've struck a ringbolt—no, it isn't—it's something in the blubber—head of an iron—somebody has had a crack at this whale before.

The boat was securely fastened in a similar way by cutting a makeshift for a ringbolt in the floor of ice.

Every boat should have a strong ringbolt on each side in the quarters for boom lashings, etc.