How to select the right file diameter
Calculating the chain pitch:
Chain pitch is calculated by measuring the distance between any three consecutive rivets, and then dividing the result by two. (Point of reference is the middle of the rivet) Dimensions given in inch.
Calculate file diameter: Chain pitch - file diameter
1/4P - 4/32(3.5mm)
3/8"LP - 5/32"(4.0mm)
.325" - 3/16" (4.8mm)
3/8" - 13/64(5.2mm)
.404" - 7/32" (5.5mm)
P=PICOO/LOW PRO