Absoluteblack premium bolt covers are designed specifically for Ultegra 6800 cranks. They cover the small step down between chainring and crank arms, completing the entire look of the crank. With these covers your crank looks great again.Specifications:Mass/Size: 13gColor: Black, Ultegra Grey, RedCompatibility: Ultegra 6800. Sets also work with Rotor chainrings.In the box: 4 covers and 4x T30 torx boltsMaterial: 7075 T6 aluminiumFinish: Type II anodizingSimply put, these bolt covers for Ultegra cranks make your crank look even better with AbsoluteBlack or Rotor Oval chainrings. When you switch to Absoluteblack oval rings, you create a small step down at the connection point between crank arms and chainring bolt hole area.These bolt covers fix this making your crank look great again.