grommet

A grommet is a small circle of metal that protects a hole meant for threading a cord or cable through. You lace up your favorite boots by threading a shoelace through grommets.

The eyelets on your shoes are just one type of grommet. The metal rings at the top of a shower curtain that connect to the sliding hooks on the rod are also grommets, as are the reinforced holes in a sail meant for threading ropes through. Holes in sheet metal often have grommets to protect cords and cables from being cut on the sharp metal. A grommet, which was originally "a wreath of rope," is a useful gadget.

Definitions of grommet
1

n fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines

Synonyms:
cringle, eyelet, grummet, loop
Type of:
fastener, fastening, fixing, holdfast
restraint that attaches to something or holds something in place

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