National Artcraft's glass wick holder is a clear glass tube with a flange on to that allows you to make a decorative oil lamp out of almost any suitable container. The wick holder consists of two components. The outer glass tube is 1-15/16" overall and has a 1" diameter top flange that tapers to a 1-7/16" long tube that is 9/8" in diameter. This wick holder contains an inner glass tube that actually holds and contains the wick. This tube is 1-5/16" long with a flange that is 11/32" wide. These glass wick holders are handmade. This may cause slight size variations from piece to piece. It holds a 1/8" thick braided fiberglass wick that is 12" long and will not smoke or burn down. Replacement wicks are available by the foot. A US company in business since 1949, National Artcraft is a name you can trust. National Artcraft's glass wick holder is a clear glass tube with a flange on top that allows you to make a decorative oil lamp out of almost any suitable container. The wick holder consists of two components. The outer glass tube is 1-13/16" long overall and has a 7/8" diameter top flange that tapers to 5/8" diameter. The glass insert that holds the wick is 5/8" wide at the top and tapers to a 1-1/8" long tube that is 1/4" in diameter. It holds a 1/8" thick braided fiberglass wick that is 12" long and will not smoke or burn down. These tubes are hand blown and may have slight size variations from piece to piece.