Use the chainsaw chain sharpening device to make your chainsaw as sharp as new, making your job faster and more economical Choice perfect: standard 30 sharpened front angle, anodized aluminum bracket, removable crank and guide ring set for all chainsaws. Easy to install and use: it is so easy to use as a sharpener. Simply set the clamp on the bar, position the handle on the dent, place the neck in the guide sleeve and turn the handle. Sharpen quickly and easily. It can make dull and dull string clear in just 3-5 seconds. Easy to Use: It's as easy to use as a pencil sharpener; simply place the collet on the bar, position the locking pawl over the dent, insert the cutter into the guide sleeve and turn the handle. Precise Maintenance: Every time you cut a dent, just pull the string. Precise sharpening can ensure that every tooth is repaired. Precise positioning: the locking pawl acts as a stop to ensure precise and repeatable positioning of the teeth.