Type Thickness
Top Ring CP3 - Chrome Plated Parellel Faced Internally Bevelled Top 2.44mm
2nd Ring P1 - Parallel Faced Plain 2.44mm
3rd Ring N1 - Napier, Externally Stepped Bottom With Single Hook 2.44mm
4th Ring CBEH - Chrome Plated Bevelled Edge with Helical Coil Spring 4.96mm
