Lancaster Antiques has dated this piece to the Victorian era.
They measure 20cm across and 10cm in length with a height of 5cm. There are four purpose made holes at each end for easy attachment - see photo 3.

The last image show them as they were and before we had them professionally polished.
Lancaster Antiques has dated this piece to the Victorian era.
You can view the stock and full dealer information on the Lancaster Antiques Profile Page