5 sets of bicycle chainring bolts made of 7075 aluminum alloy with anodized finish, super light and durable, great replacement accessory for your bicycle chainring. Features: 5 sets of bicycle chainring bolt. Made of 7075 aluminum alloy, super lightweight and durable. Anodized finish. Compatible with single chainrings or double chainrings. Specifications: Material: Anodized 7075 aluminum alloy Color: Silver / Gold / Red / Black / Blue (Optional) Compatible with: Single Chainring / Double Chainring (Optional) Nut Shaft Length: 5mm (for single chainring) / 7mm (for double chainring) Nut Head Diameter: 12mm Nut Shaft Diameter: 10mm Bolt Size: M8*7.8mm Bolt Head Diameter: 12mm Package size: 10 * 7 * 1cm / 3.9 * 2.8 * 0.4in Package weight: 12g / 0.4in Package List: 5 * Chainring Bolts