As simplistic as they may look, wick holders are little accessories that will save you a lot of unnecessary frustration when the time has come to install the wick in your mold or your container.
Their sole goal in life is to keep your wicks straight and well centered when you pour the wax and while it sets.
Made of a metal rod folded in two, the traditional wick holder (see picture above) is a precious ally to keep your wicks straight and centered in the mold (or the container) while you pour the wax and while it sets.
Using it is child's play: just catch the wick between the two arms of the wick holder, straighten it by pulling on its extremity and center the wick.
If you're making a molded candle, the other end of the wick is threaded through the wick hole at the bottom of the mold and kept in place with a generous amount of mold sealer.
Another type of wick holder has become very popular with candlemakers who specialize in container candles: the self-centering wick holder. You just place it on top of the container (or the mold, it's not only for containers) and it practically self-centers thanks to its dented shape. The wick gets caught in one of the drop-shaped openings. There are three such openings, which makes it very convenient when you make double-wicked candles.
You can get wick holders from candlemaking supplies stores or from Amazon.