39mm flat glass, 1.3mm thick (39flat)
39.4mm domed glass, 1.5mm thick (39.5dome)
2in 48.5mm flat glass, 2mm thick (2flat)
2in 48.5mm domed glass (2Dome)
2 inch, 49.5mm domed glass
50mm flat glass, 2mm thick, 2" Lucas Ammeter and Prewar AC Gauges (50x2)
56mm flat glass, 2mm thick, 2" Smiths series SN gauges (56x2)
65mm flat glass, 2mm thick, 2" Smiths SSM series 2000 gauges (65x2)
74.8mm flat glass, 2mm thick for Jaeger or Smiths 3in chronometric gauges (80x2)
74.8mm flat glass, 3mm thick for Jaeger or Smiths 3in chronometric gauges (80x3)
76mm flat glass, 2mm thick (76x2)
81.5mm flat glass, 2mm thick for Veglia motorcycle gauges (81x2)