It takes only one stray rock or a dirt-embedded log to dull a chain saw, making it both unsafe and ineffective. Now there's an alternative to the tedious process of hand sharpening: The PowerSharp Sharpening System provides an easy, on-the-fly way to freshen up the teeth of your saw. The kit contains a special bar, a chain, and a sharpening unit. You clip the sharpening unit on to the end of the bar and give the saw's engine a few revs while pushing against the sharpener. This causes the teeth to run along an internal sharpening stone. A diamond link on the chain hones the stone as it passes, ensuring a nice even sharpening each time.
¦ Price: $75 for complete kit, $35 for replacement chain and sharpening stone. 800-223-5168.