• American pattern round
  chainsaw file
• Round shape, smooth cut
• Tighten tension on chain to
  firmly support cutters when filing
• File from inside to outside
  of cutter
• Place file against bevelled
  cutting surface of teeth 20 to 45 with saw
• Follow saw manufacturers’
  specifications
• Sharpen all left hand
  cutters on one side of chain
• Then move to the other side
  and file all the right hand cutters
• Check depth gauge height
  every 2 or 3 sharpenings
• Height between cutting teeth
  and depth gauge is between .020″ to .030″

Nicholson, Cooper Tools 1891 8″ x 5/32″ Round Chainsaw File, 1 File per Card CG01891