This Shimano FC-6800 Crank Arm Fixing bolt can be mounted on a Shimano 6800 Ultegra, 5800 105 and the 4700 Tiagra cranks.
This is indicated as being an 'A' match which indicates that the parts are identical.
Genuine Shimano replacement part.
Shimano manufactures a wide range of components for all types of bikes and riders and are best known for their groupsets, wheels and shoes. The innovative company’s components, such as the Di2 electrical components are used in high end road bikes.