• Made of 12.9-grade alloy steel, the highest metric class for strength. 12.9 screw bolt is one of the highest grades of bolts produced. The surface is plated with black zinc which provides longer service life
• It has a wide range of uses. Ranging from manufacturing applications to household repair. Such as plumbing works, industrial machinery, construction, automotive, marine, bicycle, 3D printer components and DIY projects, etc
• 100pcs screw bolts are stored in a transparent plastic box for easy storage and use

Specifications:

• Product material: alloy steel
• Surface treatment: black zinc plated
• Strength grade: 12.9