ST PRS 1501 Manuel D'utilisation page 46

– the inside of the guide is worn enough to make the
chain lean to one side.
Given product evolution, the tools may be replaced in
time with others having similar interchangeable and
operating safety characteristics.
Chain pitch
inches: 3/8 Mini
mm: 9,32
Limiter tooth level (a)
a = 0,45 mm (0,018") a = 0,45 mm (0,018")
File diameter (d)
d = 4 mm (5/32") d = 4 mm (5/32")