Grobet USA Swiss Pattern Precision 6" Half-Round Ring File, Cut 0. Grobet USA Swiss Pattern Precision files. The standard for quality and performance! Width and thickness tapered to a point. Narrower than regular half-round. Useful for filing inside of rings. Double cut on both sides. Length: 6" (150 mm), Width: 15/32" (12.0), Thickness: 9/64" (3.5 mm), Cut 0