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plural ringbolts
an eyebolt with a captive ring passing through it quotations examples
The anchors and ring-bolts, and other iron work, were blackened with coal-tar
1840, R[ichard] H[enry] D[ana], Jr., “CHAPTER XXXV”, in Two Years before the Mast. […] (Harper’s Family Library; no. CVI), New York, N.Y.: Harper & Brothers […]