These glass tealight holders are designed to be inserted into a predrilled hole. They are slightly tapered, from 43mm at the base to 45mm diameter at the top and are 25mm deep. Your hole diameter will depend on how much you wish the holder to project above the surrounding surface for a neat finish. The holders take standard shop bought tealights and votive candles. Alternatively, use them as a receptacle for homemade candles. They protect the surrounding wood from damage. Use them in turnings, carvings, table decorations, branchwood or driftwood etc. Sold singly.