Application: This is a great portable tool for field sharpening. Used for chainsaws. Used to fix in the wood to hold the guide bar steady while filing the chain on the saw. High Quality: It is made of high strength metal and coated with painting to provide maximum strength and longevity; the strong and sharp front fork can be easily pushed into any tree stump. High-quality design: the vise is easily knocked into the stump and then tight on the guide rod. The chain will move freely for easy sharpening. Easy to use: simply push the vise into the stump, log or wood, place the saw blade in vice, tighten the wing nut to lock it onto the saw bar. The chain moves freely, so you can sharpen all sides neatly