Rebaydo 2pcs E17 Male to E10 Female Converter Adapter designed to convert E17 sockets and fixtures to accept E10 bulbs without replacing the fixture or modifying existing wiring. Constructed from copper and protected with a heat-shrinkable insulating sleeve for durability and reliable electrical conductivity. This adapter contains no electronics and simply transfers voltage, current, and wattage from the E17 socket to the E10 bulb. Rated for 0-277V AC or DC, up to 4 amps, and up to 400 watts. Measures approximately 0.820 inches long by 0.693 inches in maximum diameter. CE and RoHS listed.