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Eyelet
From WikiPedalia
- A reinforcement in a spoke hole of a rim. Eyelets provide a wider bearing surface against the rim, making it less likely for the nipple to pull through the rim. They also provide a smoother surface for the nipples to turn against while they are being tightened. Also sometimes called "ferrules"
Rim cross-sections Rim without eyelets Rim with eyelets Rim with recessed spoke holes and no eyelets Rim with recessed spoke holes and eyelets Socketed rim with eyelets 
- A braze-on or other threaded fitting for bolting an accessory to a frame. This term is mainly used to refer to the threaded tabs on fork ends, to which you may attach fenders or racks.
