(Note: Measurements are outside max. dimensions unless stated otherwise).19th Century : Regency patera with conical fluted design.Diam. 8mm. (5/16")Height 8mm. (5/16")Tang length 15mm. (9/16")Single central tang on 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.