PFERD Filing Clamp 17080 // Portable filing clamp made of solid steel for sharpening saw chain in the forest. It can be hammered into a tree stump or tree trunk and fixes the guide bar in place. Since the chain saw is prevented from slipping, better sharpening results can be achieved. The chain can move freely during sharpening. // Packaging unit: 1 piece // Applications: Fixing guide bars in place // Recommendations for use: Hammer the filing clamp into a tree stump or tree trunk to fix the guide bar in place. Better sharpening results can be achieved by fixing chain saw guide bars in place during sharpening in the forest.