This sustainer base is 20 mm wide x 6 mm tall with a 3mm hole, and works with any size wick including our 60 Ply wicking. To use, place wick in center hole of wick sustainer base and squeeze shut to secure wick. Then place in container for pouring. The longer neck helps to snuff the flame sooner, which reduces the chances of containers getting too hot when the candle nears the bottom. Made of thick steel coated with tin to resist corrosion. Pack of 100.