Heavy Duty Bar Mount Saw Chain Sharpener - A Perfect Woodworking Tool for You! Main features: - Handy and greatly effective blade sharpeners help sharpen the blade easily and quickly - Heavy duty whetstone with maximum wear resistance for long lasting performance - Convenient bar mounted sharpener clamps easily and quickly to the tip of the guide bar -Versatile sharpener fits any guide bar with twin guide holes to make light work of sharpening How to use: 1. Open the plastic panel at 90 degree 2. Fix the chainsaw on the two hole of the sharpener 3. Close the plastic panel and push the safety buckle 4. Gently press down until it touches the whetstone Warm tips: 1. The chainsaw sharpener is designed with 2 rivets. One is fixed and the other is adjustable, suitable for 14 to 20 inch two holes chain bar. 2. If your chain bar only has one hole, please remove the inside metal plate firstly by a Phillips head screwdriver,then take out the adjustable rivet. In this case, the sharpener will work fine.