Dia Tip Kogyo Co., Ltd. This is a wood saw blade for guiding. 【Specifications】 Outer Diameter: 180 mm Thickness: 1.6 mm Inner Diameter: Φ20 Number of Teeth: 48P Application: For guiding ※ Both sides finished ※ Ring included I received this as a spare tool when a carpenter retired, but I don't have a 147mm circular saw, so I won't be using it. For those who will use it, it's new, but the packaging is old, so the product condition is listed as "No noticeable scratches or stains." Please make your decision based on the description and photos. Thank you for your consideration. Best regards.