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1.
A ring or cap of metal put round a cane, tool, handle, or other similar object, to strengthen it, or prevent splitting and wearing.
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2.
Any of various circular or cylindrical metal objects used at joints in a tube, pipe, or rod, especially to assist making a tight seal at a joint.(Machinery)
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3.
A bushing for expanding the end of a flue to fasten it tightly in the tube plate, or for partly filling up its mouth.(Steam Boilers)
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4.
A bushing used at the joints of metal tubing in HPLC equipment to make a tight seal.(Chemistry)
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5.
One of several small rings at the top of a casting rod which holds the fishing line.(Fishing)