5mm thick. 11.8" / 300mm OD; 56.3mm ID; 10.5mm (3/8") counterbored mounting holes with 3.25" bolt circle dimaeter / 48.6mm mount hole to mount hole distance. Mount style ''B''. OEM replacement reference 41810-08B; 41810-08C. SBS brake discs fit standard H-D 5-bolt hubs. Model year applications and OEM H-D part numbers are given for reference only and may feature a custom styling. Check mounting style details for use in custom applications. All SBS brake discs are made of a high quality stainless steel; alloyed with a high carbon content; to offer excellent brake performance and reliable stopping power in any condition. All brake discs are EU manufactured by craftsmen using high-end grinding machines for a perfectly flat disc that will work without noise or vibrations. - High quality stainless steel with high carbon content - Installs like stock - Perfect brake performance & stopping power under all conditions - Long life - High comfort level – no noise; no vibrations - High temperature resistance - Anti-corrosion treatment - Perfect suitable for all SBS brake pad compounds - Heat-treated stainless steel center hubs