This simple tool from WoodlandPRO is loaded with features for hand filing. No need to take the chain off your saw, simply place this guide right on your chain. It has built in slots to maintain your depth gauges (rakers) to .025" or .030" thousandths. It has guides so you can file your cutters at 35 degree angle. One end of the tool also has a groove cleaner so you can easily clean the groove of your bar. Made of hardened, zinc plated steel.