Features 1. This enables users to sharpen their chains on the saw at work 2. Provide a fast, simple and portable saw chain grinding method 3. The sharpening stone is installed in the rod sharpener 4. Clip on the end of the guide rod when sharpening the knife 5. Ease of use SAFE AND EFFECTIVE: Our chainsaw sharpener provides a quick and easy way to sharpen your chainsaw with a protective case that protects your hands from direct contact with the sharpening stone and protects your hands from injury. In just 3-5 seconds, your chainsaw will be sharp again Versatility: Fits most 14/16/18/20 inch chainsaws and petrol saws available for a wide range of applications EASY TO USE: The chainsaw sharpener is made of high-quality durable materials. The chainsaw sharpener is installed inside the sharpener, keeping the chain and guide rod oiled, reducing friction, quick disassembly, quick use, and greatly improving work efficiency How to use Step1 Pull down the security board, open chainsaw sharpener. Step2 Attach the chainsaw on the two holes of the sharpener. Step3 Close the outer casing of the chain cutter and push the security board. Step4 Gently squeeze the chainsaw down until it touches the whetstone. 1. Put some bar oil on the sharpening stone inside the sharpener, so you can push very lightly and very briefly when honing the chain. 2. For the safety of the chain saw, you need to gently press the sharpener to avoid excessive sharpening and damage the sprocket and whetstone. 3. When starting the chainsaw, press the foot of the sharpener against a solid object, applying light pressure to let the chainsaw reach the whetstone for 3-5 seconds. 4. Remember to fix and tighten the screws when sharpening the chain. 5. Close the sharpener and make sure it lock and secured before using