(Note: Measurements are outside max. dimensions unless stated otherwise).19th Century : Spinning sunburst patera. Diam. 31mm. (1 3/16")Max depth 3mm. (1/8")Single central tang on flat reverse.It is recommended that if selecting screw thread option, a pilot hole is drilled and pre-cut with a steel screw of slightly smaller size before screwing in the casting to avoid shearing.