Thank you for viewing. This item is unused. It has been stored at home without the outer box or instruction manual. Please purchase if you understand how to use it. I have checked for stains and distortions, but please understand that I may have overlooked something. ○ Length: Approximately 6.4 cm ○ Width: Approximately 8 mm ○ Material is unknown. The bolt does not stick to a magnet, but the nut lightly sticks to a magnet. Bolt weight only: Approximately 20g Please check the details in the photos. We will ship anonymously via post size.