Semilac Nail File "HARBOR BRIDGE" 100/180. This designer file combines two shapes to put the perfect nail look within your reach! The straight file is used for shortening the nail plate, while the round file is used for refining the nail shaft and removing acrylic or gel polish. The tool's durability is ensured by its innovative Japanese zinc-plated material. The abrasive material retains its sharpness for a long time, and the new insert technology makes the file very stable.