Tips: These are small parts. For a tight fit, the hole should be equal to or slightly smaller than the pin diameter (5mm). Book screws are suitable for connecting or fixing books, menus, folders, presentations, information sheets, advertising brochures, and other paper printing materials. Material: carbon steel. Strong and rust resistant. Attention: Keep away from children. Product name: Screw Assorted Kit Product weight: 150g Product specifications: M5*15mm Product material: carbon steel Color: Gold Features: Binding screws are also a good choice for home improvement. They can also be used as decorative accessories. Scope of delivery: Assorted screw kit * 50 Quantity delivered: 50 pieces Product color: gold Product size: M5*15mm Note: Manual measurement, please allow 1-3mm error.