Can be found in home center and department stores, specialty stores and small DIY boutiques.

https://www.amazon.com/dp/B01M7N5EMK

• 200 pcs
• Tabs Dia: 0.5" (12,5mm);
• Central hole Dia: 0,09" (2.5 mm);
• Neck's Height: 0.23" (6mm); 
• Cut your wick, thread it through, pinch the center with a pair of pliers;
• Great for making your own candles!