These candlesticks are a typical 17th century Dutch form that was produced in large quantities in Dutch Indonesia for nearly two centuries. These are, by far, the biggest ones we have ever seen. Judging from the number small casting flaws that had to be repaired when they were made the founder was pushing the limits of his ability to produce sticks of this size. They are cast in four sections and likely were originally fitted with iron prickets.
I’ve included a normal 8 inch candlestick in the first photo for comparison.