EFFECTIVE SHARPENER This electric saw sharpener provides a quick and easy way to sharpen the knife. Press the sharpener tip onto a firm surface and you will get a sharp cutting edge in seconds. CUSTOM DESIGN It suitable for 14/16/18/20 inch chain saws, the saw chain blade has 1-2 holes and there are 2 pins on saw sharpener (one of the pins is removable) for fixing electric blade of saw sharpener. GOOD SHRINK PERFORMANCE The bottom of electric saw sharpener is made of high quality stainless steel springs. If the electric saw is inserted into sharpener, but the size of the electric saw is not large enough to touch the sharpening stone, please press the spring. The spring makes sharpener suitable for more sizes of chainsaws. CONVENIENT AND QUICK The sharpener is light, small in size, easy to carry and use outdoors, your hands do not have to touch the stone at sharpen. HIGH QUALITY chainsaw sharpener is made of high quality durable plastic and sharpening stones to ensure your safety and quickly restore the working performance of the chainsaw. is a good helper to improve work efficiency. PRACTICALITY: Quick grinding: This chain grinding tool can be grinded in just 3-5 seconds. Easy to use: Chainsaw sharpener is super easy to use, just insert the chainsaw blade into the two sharpening holes. Convenient and quick: Our chainsaw sharpener test allows you to sharpen the chain quickly and easily without removing it from the saw. INSTALLATION: Step 1: Open the saw chain. Step 2: Place the chainsaw in the saw sharpener and line up the holes. Step 3: Close the lid and press the latch. Step 4: Start the chainsaw and press it for 3-5 seconds until it touches the sharpening stone. PACKAGE INCLUDES: 1 chain sharpener 3 sharpening stones NOTE: 1. When using, remember to tighten and tighten the screws. Before use, turn off the sharpening saw and make sure it is locked and secure.