There are few things more dangerous in your tool shed than a dull chainsaw blade. On the best of days, a chainsaw is something that should be used very cautiously but a dull blade is both dangerous to both the user as well as the engine of the chainsaw itself. With this chainsaw sharpening kit you can use your rotary tool to get the important job done. Includes guide attachment and four sizes of bits: 3/16" Orange 120 Grit, 11/64" White 220 Grit, 5/32" Blue 220 Grit, and 7/32" Red 120 Grit.