Wick Centering Tool | Wick Placement Template Made of 3mm (1/8") basswood.  Perfectly centers single and double wick candles.  Fits 20 mm wick tabs and wood wick tabs.  Measure the diameter at the INNER BOTTOM of the jar, NOT the diameter at the top. Set includes 1 single and 1 double wick (2 pcs) for 3", 3.25", and 3.5" Set includes 2 singles (2pcs) for 2.25" and 2.5" Set includes 1 double and 1 triple wick (2 pcs) for 3.90" -- This size fits our 3-wick ceramic vessels. We can make any size requested...select custom size as option. :) Size Chart --> We are continuously updating this spreadsheet, please email us to add your vessel to the list! :-)