For most of us it's nearly impossible to recapture the original edge on our Silky Saw, and therefore many people prefer to simply purchase a replacement blade. Most Silky blades are impulse hardened (the teeth and blades are heated instantly and hardened) and stay sharp about three times longer than non-hardened teeth. These blades are therefore incredibly difficult to sharpen. There are saw doctors with specialised machinery that can do it for you, but there is a cost to this. Some Silky blades however are not impulse hardened, and more commonly the larger saws. For these saws, if you do wish to sharpen the blades, we recommend the Silky Feather Edge Sharpening File. This file is wedge shaped on both sides which allows you to get right in to the teeth of the blade. Attached also is the Feather Edge File User Guide that shows you a list of Silky Saws that are sharpenable and the angles that you should be sharpening to.