"Features: 1. It is used to prevent slipping in place of the button of metal products or other crafts of the sawing machinery. 2. suitable for mechanical process metal button or other work on the appearance of the bearing pattern for non-slip Specification: Pattern: Straight Linear Knurling pitch: 0.8mm / 0.03 inches Hanawa outer diameter: 28mm (1.1 inches) Hanawa inner diameter: 8mm (0.3 inches) Hanawa thickness: 8mm / 0.31 inches Note Allow 1-3mm error due to manual measurement. Due to the difference between different monitors, the image may not reflect the actual color of the item. Package Including: 2-piece linear sawing wheel