12'' mechanical candles are great for any candelabra application where a safe, but real flame is needed. Mechanical candles have a spring that gently pushes upwards on the small wax candle refill inside so you always have the perfect flame, but none of the hassles. Mechanical candles are 3/4" diameter and a rubber gripper ring is included if you need to go to 7/8'' diameter. Mechanical candles won't drip, wilt or melt down and work great in candelabras.