Beehive Frame Copper Eyelets are small metal fittings placed in the holes to prevent the frame wire from cutting into the wood. They are one of the most important parts of beekeeping, great when adding wire to the frames to minimize damage to the wood. It is a must-have set for cross-wiring, eyelets are inserted into the predrilled holes in the end bars. Eyelets are a great way to save your frames from becoming damaged over time by the wire digging into the frames.