Oregon VersaCut chain guide bar for MS310 / MS311 20" chainsaws 

20" oregon Versacut bar. 

Made in Canada, top quality guide bar

BAR FITS 72 Links of 3/8 75LP

Count the number of drive links in your old chain to determine your chain length.

The drive links are the bottom parts of the chain that sit down into the guide bar.

Take chain off chainsaw, lay flat and count the drive links in 2's e.g. 2,4,6,8,10 for the easiest way to find you chain lenght.

Chain Specification
Bar Length: 20" (72 chain Links)
Chain Pitch: 3/8" 75LP
Chain Gauge: .063" / 1.6mm
Chain File Size: 5.2mm / 13/64"

FITS:

Stihl MS 310 guide bar

Stihl MS 311 guide bar