The final set of numbers show how many drive links are in the chainsaw chain that will run on that specific bar. This bar has “72” stamped, so it would need a 72 drive link chain. Drive link count can range anywhere from 28 to 210 depending on your bar size. Finally there may be a letter found at the end of the bar.

For most projects, you'll want a chainsaw that extends approximately 2-4 inches beyond what it is you'll be cutting. For example, if you're cutting a tree trunk that is approximately 12 inches wide, a 14" or 16" chainsaw would be ideal.

My saw is quite powerful, but it is a consumer saw that was/is designed for 'low profile' (lp) chain; specifically 3/8 lp 050 chain. Low profile chain is supposed to be safer because it doesn't kick back as easily as regular chain, and being a little smaller, does not require so much torque.