SS12= 1/16" F
SS16= 1/8"F, RM
SS20= 3/16" F, P, RM
SS30= 1/4" F,P, RM
SS34= 5/16" F, P
SS40= 3/8 F, P, RM

4mm= 3/16 LR
6mm= 1/4" LR
7mm= 5/16 LR
8mm = 3/8 LR
10mm = 7/76 LR

Abbreviations

F = Flat Back
P = Point Back
RM = Rose Montes
LR = Loch Rosen